Aniline on direct nitration yields
(A) $51%$-ortho, $47%$-para, $2%$-meta derivatives
(B) $51%$-meta, $47%$-ortho, $2%$-para derivatives
(C) $51%$-para, $47%$-meta, $2%$-ortho derivatives
(D) $51%$-ortho, $47%$-meta, $2%$-para derivatives
CBSE CLASS 12 • CHEMISTRY • CHAPTER 09
Amines
150 distinct questions across 201 board paper set appearances (2022–2026).
The reaction of amines with mineral acids to form ammonium salts shows that these are basic in nature. Aliphatic amines are stronger bases than ammonia whereas aromatic amines are weaker bases than ammonia. Aliphatic and aromatic primary and secondary amines react with acid chlorides, anhydrides and...
The correct formula of Hinsberg's reagent is :
(A) $\text{C}_6\text{H}_5\text{COCl}$
(B) $\text{C}_6\text{H}_5\text{SO}_2\text{Cl}$
(C) $\text{C}_6\text{H}_5\text{CONHCH}_3$
(D) $\text{C}_6\text{H}_5\text{CH}_2\text{NH}_2$
Which of the following reactions is used for the preparation of Aniline ?
(A) Reaction of ethanolic $\text{NH}_3$ with $\text{C}_6\text{H}_5\text{Cl}$
(B) Reaction of Nitrobenzene with Hydrogen gas in presence of finely divided Nickel
(C) Reaction of Benzamide with $\text{LiAlH}_4$
(D) Reaction of B...
Amines are usually formed from amides, imides, halides, nitro compounds, etc. They exhibit hydrogen bonding which influences their physical properties. In alkyl amines, a combination of electron releasing, steric and H-bonding factors influence the stability of the substituted ammonium cations in pr...
Which of the following amines has the highest boiling point ?
(A) 2,2-Dimethyl propanamine
(B) 3-Methylbutanamine
(C) 2-Methylbutanamine
(D) Pentanamine
The chemical test which can be used to distinguish between ethanamine and aniline is :
(A) Haloform test
(B) Tollens' test
(C) Azo dye test
(D) Hinsberg test
Give plausible explanation for the following :
(a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel-Crafts reaction.
(c) Aniline on nitration gives a substantial amount of meta product.
Assertion (A) : Acetylation of aniline gives a monosubstituted product.
Reason (R) : Activating effect of $-\text{NHCOCH}_3$ group is more than that of amino group.
Write the chemical equation involved in the following reactions : (a) Carbylamine reaction (b) Gabriel phthalimide synthesis
Assertion (A) : Monobromination of aniline can be conveniently done by protecting the amino group by acetylation. Reason (R) : Acetylation decreases the activating effect of the amino group.
Amines are usually formed from nitro compounds, halides, amides, imides, etc. They exhibit hydrogen bonding which influences their physical properties. In alkyl amines, a combination of electron releasing, steric and hydrogen bonding factors influence the stability of the substituted ammonium cation...
(a) (i) Draw the zwitter ion structure for sulphanilic acid.
(ii) How can the activating effect of $-\text{NH}_2$ group in aniline be controlled?
OR
(b) (i) Complete the reaction with the main product formed :
(Image showing benzenediazonium chloride reacting with ethanol)
(ii) Convert Bromoethane t...
Assertion (A) : Benzene diazonium salt is stable and can be easily stored. Reason (R) : Benzene diazonium chloride decomposes easily.
(a) Illustrate the following reactions giving suitable example in each case :
(i) Gabriel phthalimide synthesis.
(ii) Carbylamine reaction.
(iii) Hoffmann bromamide degradation reaction.
OR
(b) Write the structures of A, B and C in the following reactions :
(i) $\text{CH}_3\text{CH}_2\text{Cl} \xrig...
Read the following passage and answer the questions that follow :
Amines constitute an important class of organic compounds derived by replacing one or more hydrogen atoms of ammonia molecule by alkyl/aryl groups. Amines are usually formed from nitro compounds, halides, amides, etc. They exhibit hy...
Give reasons :
(i) Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
(ii) Aniline does not give Friedel-Crafts reaction.
(iii) Although $- ext{NH}_2$ group is o/p directing in electrophilic substitution reactions, yet aniline on nitration gives good yield of m-nitroan...
(a) Write reasons for the following : (i) Ethylamine is soluble in water whereas aniline is insoluble. (ii) Amino group is o- and p-directing in aromatic electrophilic substitution reactions, but aniline on nitration gives a substantial amount of m-nitroaniline. (iii) Amines behave as nucleophiles. ...
(a) Write equations involved in the following reactions : (i) Ethanamine reacts with acetyl chloride. (ii) Aniline reacts with bromine water at room temperature. (iii) Aniline reacts with chloroform and ethanolic potassium hydroxide.
Answer the following questions :
(a) (i) Why $ ext{CH}_3 - ext{NH}_2$ is a stronger base than $( ext{CH}_3)_3 ext{N}$ in aqueous solution ?
(ii) Write structural formulae of the compound A and B :
$\text{CH}_3 ext{CONH}_2 \xrightarrow{\text{NaOBr}} \text{A} \xrightarrow[\text{Base}]{\text{C}_6\text...
Like $\text{NH}_3$, nitrogen atom of amine is trivalent and carries an unshared pair of electrons. Nitrogen orbitals in amines are therefore $\text{sp}^3$ hybridised and the geometry of amines is pyramidal. Lower aliphatic amines are soluble in water due to the formation of hydrogen bond with water ...
Identify the compound produced by the reduction of Ethanenitrile with Lithium aluminium hydride :
(A) Ethylamine
(B) Ethanal
(C) Propylamine
(D) Methylamine
(a) (i) (I) The $ ext{pK}_ ext{b}$ value of aniline is higher than that of methylamine. Explain why.
(II) Arrange the following compounds in decreasing order of their basic strength in the gaseous phase :
$ ext{NH}_3$, $( ext{C}_2 ext{H}_5)_2 ext{NH}$, $( ext{C}_2 ext{H}_5)_3 ext{N}$, $ ext{C}_2 ext...
Assertion (A) : Acetanilide is less basic than aniline.
Reason (R) : Acetylation of aniline results in decrease of electron density on nitrogen.
The IUPAC name for $\text{CH}_3 - \text{CH}_2 - \text{N}(\text{CH}_3) - \text{CH}_2 - \text{CH}_2 - \text{CH}_3$ is :
(A) N-methylpentan-2-amine
(B) N-ethyl-N-methylpropan-1-amine
(C) N,N-diethylpropan-1-amine
(D) N,N-dimethylpropan-1-amine
(a) (i) In a chemistry practical class, the teacher gave his students an amine 'X' having molecular formula $ ext{C}_2 ext{H}_7 ext{N}$, and asked the students to identify the type of amine. One of the students, Neeta, observed that it reacts with $ ext{C}_6 ext{H}_5 ext{SO}_2 ext{Cl}$, to give a co...
Ethanamine reacts with benzoyl chloride to form a product 'X'. Give the structure and IUPAC name of 'X'. Can 'X' undergo Hoffmann bromamide degradation reaction ? If yes, then give the structure of the product. If no, then give reason.
What is the most suitable pKa value of the substituted propylamine formed with substituent "X" with electronegativity 3.0 (i)10.67 (ii)10.08 (iii)10.15 (iv)11.10
Explain briefly : (a) Carbylamine reaction (b) Gabriel phthalimide synthesis
(a) Write the structures of A, B and C in the following reactions : (i) $\text{C}_6\text{H}_5\text{COOH} \xrightarrow[\Delta]{\text{NH}_3} \text{A} \xrightarrow{\text{Br}_2 + \text{NaOH}} \text{B} \xrightarrow[0^\circ\text{C}]{\text{NaNO}_2 + \text{HCl}} \text{C}$ (ii) $\text{CH}_3\text{CH}_2\text{B...
(b) How will you carry out the following conversions :
(i) Nitrobenzene to Aniline
(ii) Ethanamide to Methanamine
(iii) Ethanenitrile to Ethanamine
(a) Account for the following : (i) $\text{pk}_b$ of aniline is more than that of methylamine. (ii) Aniline does not undergo Friedel-Crafts reaction. (iii) Primary amines have higher boiling points than tertiary amines. OR (b) (i) Arrange the following compounds in the increasing order of their basi...
Identify the compound produced by the reduction of Ethanenitrile with Lithium aluminium hydride :
(A) $\text{Ethylamine}$
(B) $\text{Ethanal}$
(C) $\text{Propylamine}$
(D) $\text{Methylamine}$
Like $ ext{NH}_3$, nitrogen atom of amine is trivalent and carries an unshared pair of electrons. Nitrogen orbitals in amines are therefore $ ext{sp}^3$ hybridised and the geometry of amines is pyramidal. Lower aliphatic amines are soluble in water due to the formation of hydrogen bond with water mo...
Assertion (A) : At low temperatures ($273 - 278\text{ K}$), arenediazonium salts are more stable in solution than alkyldiazonium salts.
Reason (R) : The arenediazonium ion shows resonance.
What happens when :
(a) Aniline is treated with bromine water ?
(b) Ethanamide is treated with $ ext{Br}_2$ and aqueous $ ext{NaOH}$ ?
(c) Benzenediazonium chloride is treated with warm water ?
The reaction of ammonia with a large excess of ethyl chloride will give mainly :
(A) Ethylamine
(B) Tetraethylammonium chloride
(C) Triethylamine
(D) Diethylamine
Acetamide reacts with $ ext{Br}_2$ and aqueous $ ext{KOH}$ to form :
(A) Ethanamine
(B) Ammonia
(C) Methanamine
(D) Ethanenitrile
Assertion (A) : Boiling point of propylamine is higher than that of trimethylamine.
Reason (R) : In propylamine, intermolecular hydrogen bonding occurs, whereas trimethylamine does not undergo intermolecular hydrogen bonding.
Explain the following :
(a) Carbylamine reaction
(b) Hoffmann's bromamide degradation reaction
(c) Diazotisation reaction
Assertion (A) : Aromatic primary amines cannot be prepared by Gabriel phthalimide synthesis.
Reason (R) : Gabriel phthalimide synthesis is used for the preparation of primary aliphatic amines.
Assertion (A) : Aromatic primary amines can easily be prepared by Gabriel phthalimide synthesis.\nReason (R) : Gabriel phthalimide synthesis is used to prepare only aliphatic primary amines.
Which reagent is used to distinguish between primary, secondary and tertiary amines ?
(A) $ ext{C}_6 ext{H}_5 ext{SO}_2 ext{Cl}$
(B) $ ext{C}_6 ext{H}_5 ext{COCl}$
(C) $ ext{CHCl}_3 + ext{ethanolic KOH}$
(D) $ ext{NaOH} + ext{I}_2$
Assertion (A) : Monobromination of aniline can be conveniently done by protecting the amino group by acetylation.\nReason (R) : Acetylation increases the activation effect of the amino group.
How will you obtain the following from aniline ? Write the chemical equations involved :
(a) Sulphanilic acid
(b) $2,4,6$-Tribromoaniline
(c) Acetanilide
Assertion ($A$) : Diazonium salts of aromatic amines are more stable than those of aliphatic amines.
Reason ($R$) : Diazonium salts of aliphatic amines undergo resonance.
Write the structures of A, B and C in the following reactions :
(a) Image showing aniline reacting with (\text{CH}_3\text{CO})_2\text{O} to give A, then reacting with \text{Br}_2 / \text{CH}_3\text{COOH} to give B, then reacting with \text{H}^+ to give C
(b) Image showing 2-bromo-4-nitrotoluene re...
Which of the following reagent is used to convert benzene diazonium chloride to benzene ?
(A) $\text{H}_2\text{O}$
(B) $\text{LiAlH}_4$
(C) $\text{C}_2\text{H}_5\text{OH}$
(D) $\text{CuCN}$
Assertion (A) : Diazonium salts of aromatic amines are more stable than those of aliphatic amines.
Reason (R) : Diazonium salts of aromatic amines undergo resonance.
Assertion (A) : Diazonium salts of aromatic amines are less stable than those of aliphatic amines.
Reason (R) : Diazonium salts of aromatic amines undergo resonance.
Which of the following reagents are used to prepare primary amines by Hoffmann bromamide degradation reaction ?
(i) $\begin{matrix} \text{O} \\ \Vert \\ \text{R}-\text{C}-\text{NH}_2 \end{matrix}$
(ii) $\text{NaOH}$
(iii) $\text{Br}_2$
(iv) $\text{CHCl}_3$
(A) (i), (ii) and (iv)
(B) (i) and (iii)
(C...
Which of the following reagents are used to prepare primary amines by Hoffmann bromamide degradation reaction ?
(i) $\text{R}-\text{C}-\text{NH}_2$ with double bond to O on top
(ii) $\text{NaOH}$
(iii) $\text{Br}_2$
(iv) $\text{CHCl}_3$
(A) (i), (ii) and (iv)
(B) (i) and (iii)
(C) (i), (ii) and (iii...
Which of the following reagents are used to prepare primary amines by Hoffmann bromamide degradation reaction ?
(i) $\begin{matrix} \text{O} \\ \parallel \\ \text{R}-\text{C}-\text{NH}_2 \end{matrix}$
(ii) $\text{NaOH}$
(iii) $\text{Br}_2$
(iv) $\text{CHCl}_3$
(A) (i), (ii) and (iv)
(B) (i) and (iii...
(i) Complete the following equations :
(I) $\text{CH}_3\text{NH}_2 + \text{C}_6\text{H}_5\text{COCl} \longrightarrow$
(II) \chemfig{[:90]*6(-=(-NH_2)-=-)} $+ 3 \text{Br}_2 \xrightarrow{\text{H}_2\text{O}}$
(III) \chemfig{[:90]*6(-=(-CONH_2)-=-)} $\xrightarrow{\text{NaOBr}}$
(ii) (I) Explain the carb...
(a) (i) (I) The $\text{pK}_\text{b}$ value of aniline is higher than that of methylamine. Explain why.
(II) Arrange the following compounds in decreasing order of their basic strength in the gaseous phase :
$\text{NH}_3$, $(\text{C}_2\text{H}_5)_2\text{NH}$, $(\text{C}_2\text{H}_5)_3\text{N}$, $\tex...
(ii) (I) Explain the carbylamine reaction.
(II) Why can aromatic primary amines not be prepared by the Gabriel phthalimide synthesis ?
Assertion (A): Secondary aliphatic amines react with nitrous acid to form aliphatic diazonium salts which being unstable, liberate nitrogen gas quantitatively.
Reason: Nitrogen gas evolved on reaction with nitrous acid can be used for the estimation of proteins and amino acids.
Select the most appr...
Carry out following conversions :
I. Nitrobenzene to 4- bromobenzenamine
II. Chlorophenylmethane to 2-phenyl-ethanamine
The Gabriel phthalimide synthesis is used for the preparation of :
(A) Secondary amine
(B) Primary aliphatic amines
(C) Primary aromatic amines
(D) Tertiary amines
Amines are usually formed from nitro compounds, halides, amides, imides etc. They exhibit hydrogen bonding which influence their physical properties. Alkyl amines are found to be stronger bases than ammonia. In aromatic amines, electron releasing and withdrawing groups, respectively increase and dec...
Arrange the following :
(a) (i) p-nitroaniline, p-toluidine, Aniline
(in increasing order of basic strength)
(ii) $( ext{C}_2 ext{H}_5)_2 ext{NH}, ext{C}_2 ext{H}_5 ext{NH}_2, ext{C}_6 ext{H}_5 ext{NH}_2$
(in increasing order of solubility in water)
(b) (i) $ ext{pK}_ ext{b}$ of aniline is more th...
The Gabriel Phthalimide Synthesis is used for the preparation of
(A) Secondary amines
(B) Primary aromatic amines
(C) Tertiary amines
(D) Primary aliphatic amines
Benzene diazonium chloride on hydrolysis gives
(A) Chlorobenzene
(B) Phenol
(C) Anisole
(D) Aniline
(a) How do you convert the following ?
(i) Ethanenitrile to Ethanamine
(ii) Benzenediazonium chloride to benzonitrile
OR
(b) (i) Write a simple chemical test to distinguish between ethanamine and dimethylamine.
(ii) What happens when $\text{CH}_3\text{CONH}_2$ is heated with $\text{Br}_2$ and an aqu...
Give reactions for the following :
(i) Aniline does not undergo Friedel – Crafts reaction.
(ii) $(\text{CH}_3)_2\text{NH}$ is more basic than $(\text{CH}_3)_3\text{N}$ in an aqueous solution.
(iii) Ethyl amine is soluble in water whereas aniline is insoluble.
Hoffmann Bromamide degradation reaction is given by :
(A) $\text{ArNO}_2$
(B) $\text{ArNH}_2$
(C) $\text{ArCONH}_2$
(D) $\text{ArCH}_2\text{NH}_2$
Hoffmann Bromamide degradation reaction is given by :
(A) $\text{CH}_3\text{NO}_2$
(B) $\text{CH}_3\text{NH}_2$
(C) $\text{CH}_3\text{CONH}_2$
(D) $\text{CH}_3\text{CH}_2\text{NH}_2$
Assertion (A) : Acetanilide is more basic than aniline.
Reason (R) : Acetylation of aniline results in decrease of electron density on nitrogen.
Hoffmann Bromamide degradation reaction is given by :
(A) $\text{R} - \text{NO}_2$
(B) $\text{R} - \text{NH}_2$
(C) $\text{R} - \text{CH}_2 - \text{NH}_2$
(D) $\text{R} - \text{CO} - \text{NH}_2$
In the given reaction sequence, the structure of Y would be :
Aniline $\xrightarrow[0 - 5^{\circ}\text{C}]{\text{NaNO}_2 + \text{HCl}} \text{X} \xrightarrow{\text{C}_2\text{H}_5\text{OH}} \text{Y}$
(A) Phenol structure
(B) Benzene ring structure
(C) Nitrobenzene structure
(D) Benzene diazonium chl...
(a) (i) In a chemistry practical class, the teacher gave his students an amine 'X' having molecular formula $\text{C}_2\text{H}_7\text{N}$, and asked the students to identify the type of amine. One of the students, Neeta, observed that it reacts with $\text{C}_6\text{H}_5\text{SO}_2\text{Cl}$, to gi...
(a) (iii) Aniline on nitration gives considerable amount of meta product along with ortho and para products. Why ?
(a) (iv) Convert aniline to :
(I) p-bromoaniline
(II) phenol
(b) (i) Arun heated a mixture of ethylamine and $\text{CHCl}_3$ with ethanolic $\text{KOH}$, which forms a foul smelling gas. Write the chemical equation involved.
(b) (iii) Convert aniline to :
(I) benzene
(II) sulphanilic acid
The IUPAC name for $\text{CH}_3 - \text{CH}_2 - \text{N}(\text{CH}_3) - \text{CH}_2 - \text{CH}_2 - \text{CH}_3$ is :\n\n(A) N-methylpentan-2-amine\n(B) N-ethyl-N-methylpropan-1-amine\n(C) N,N-diethylpropan-1-amine\n(D) N,N-dimethylpropan-1-amine
In the Hinsberg's method for separation of primary, secondary and tertiary amines, the reagent used is :
(A) Nitrous acid
(B) $ ext{CHCl}_3 + ext{aq. NaOH}$
(C) Benzenesulphonyl chloride (or structure)
(D) $ ext{HCl} / ext{ZnCl}_2$
How will you obtain the following from aniline ? Give chemical equations only.\n(a) Sulphanilic acid\n(b) Phenylisocyanide\n(c) Acetanilide
The gas evolved when methylamine reacts with $\text{HNO}_2$ is :
(A) $\text{NO}$
(B) $\text{N}_2$
(C) $\text{NH}_3$
(D) $\text{NO}_2$
How can you obtain the following from aniline ? Give only chemical equation.
(a) $p$-nitroaniline
(b) Chlorobenzene
(c) Phenol
How can you obtain the following ?
(a) Aniline from ammonium benzoate
(b) Benzene diazonium chloride from nitrobenzene
(c) 2,4,6-tribromoaniline from aniline
When alkyl iodide is treated with large excess of ammonia, the major product obtained is :
(A) Tertiary amine
(B) Quaternary ammonium salt
(C) Secondary amine
(D) Primary amine
An amine 'X' reacts with Hinsberg reagent and the product obtained is soluble in alkali. The amine 'X' is :
(A) $\text{CH}_3 - \text{NH}_2$
(B) $(\text{CH}_3)_2\text{NH}$
(C) $(\text{CH}_3)_3\text{N}$
(D) $\text{-NH}-\text{CH}_3$ attached to benzene ring
When excess of alkyl iodide is treated with ammonia, the product obtained is :
(A) Primary amine
(B) Secondary amine
(C) Tertiary amine
(D) A mixture of amines
An amine 'X' reacts with Hinsberg reagent and the product obtained is insoluble in alkali. The amine 'X' is :
(A) $(\text{CH}_3)_2 - \text{NH}$
(B) $(\text{CH}_3)_3\text{N}$
(C) $\text{CH}_3 - \text{CH}_2 - \text{NH}_2$
(D) 
Which of the following amines does \textit{not} give foul smell of isocyanide on heating with chloroform and ethanolic $\text{KOH}$ ?
(A) $\text{CH}_3 - \text{CH}_2 - \text{NH}_2$
(B) $\text{CH}_3 - \text{CH} - \text{CH}_2 - \text{NH}_2$ with $\text{CH}_3$ attached to CH
(C) $(\text{CH}_3 - \text{CH...
(a) Name the reaction which can be used to distinguish chemically between aniline and $\text{N,N}$-dimethylaniline.
(b) Why can aniline not be prepared by the ammonolysis of chlorobenzene under normal conditions ?
(a) Name the reaction which can be used to distinguish chemically between aniline and $ ext{N,N-dimethylaniline}$.
(b) Why can aniline not be prepared by the ammonolysis of chlorobenzene under normal conditions ?
Methanamine reacts with benzoyl chloride to form a product 'P'. Give the structure and IUPAC name of 'P'. Can 'P' undergo Hoffmann bromamide degradation reaction ? If yes, then give the structure of the product. If no, then give reason.
(a) Aniline cannot be prepared by Gabriel phthalimide synthesis. Give reason.
(b) Name the reaction which can be used to distinguish chemically between ethanamine and N-methylethanamine.
A student was preparing aniline in the lab. She took a compound "X" and reduced it in the presence of Ni as a catalyst. What could be the compound "X"
a. Nitrobenzene
b. 1-Nitrohexane
c. Benzonitrile
d. 1-Hexanenitrile
Which of the following compound gives an oxime with hydroxylamine:
a. $\text{CH}_3\text{COCH}_3$
b. $\text{CH}_3\text{COOH}$
c. $(\text{CH}_3\text{CO})_2\text{O}$
d. $\text{CH}_3\text{COCl}$
The presence of Carbonyl group in glucose is confirmed by its reaction with hydroxylamine. Identify the type of carbonyl group present and its position. Give a chemical reaction in support of your answer.
Plot a graph between the electronegativity of the substituent vs $\text{pK}_b$ value of the corresponding substituted propyl amine (given that $\text{pK}_a + \text{pK}_b = 14$). Is there any relation between the electronegativity of the substituent and its basic strength?
How does the electronegativity of the substituent affect the pKb value and the basic strength of the substituted propyl amine (given that pKa + pKb = 14).? Give a reason to support your answer.
Out of the following, the strongest base in aqueous solution is :
(A) Methylamine
(B) Dimethylamine
(C) Trimethylamine
(D) Aniline
Amides can be converted into amines by the reaction named
(A) Diazotisation
(B) Carbylamine
(C) Ammonolysis
(D) Hoffmann Bromamide degradation
Which of the following would be a better choice for reducing nitrobenzene to aniline ?
(A) $\text{H}_2/\text{Ni}$
(B) $\text{LiAlH}_4$
(C) $\text{Fe}$ and $\text{HCl}$
(D) $\text{Sn}$ and $\text{HCl}$
Account for the following : (Any three) (a) $pK_b$ of aniline is more than that of methylamine. (b) Ethylamine is soluble in water whereas aniline is not. (c) Aniline does not undergo Friedel-Crafts reaction. (d) Aromatic primary amines cannot be prepared by Gabriel phthalimide synthesis.
Assertion (A) : Aniline does not undergo Friedel-Crafts reaction.
Reason (R) : Friedel-Crafts reaction is an electrophilic substitution reaction.
Which of the following amines gives carbylamine reaction ?
(A) $\text{C}_2\text{H}_5\text{NH}_2$
(B) $(\text{C}_2\text{H}_5)_2\text{NH}$
(C) $(\text{C}_2\text{H}_5)_3\text{N}$
(D) $\text{C}_6\text{H}_5 - \text{NH} - \text{CH}_3$
Assertion (A) : Aniline undergoes Friedel-Crafts reaction.
Reason (R) : Aniline forms salt with $\text{AlCl}_3$, the Lewis acid in Friedel-Crafts reaction.
Aniline on reaction with Bromine water gives :
(A) o-bromoaniline
(B) 2,4,6-tribromoaniline
(C) m-bromoaniline
(D) p-bromoaniline
Assertion (A) : Boiling point of butan-1-ol is higher than that of butan-1-amine. Reason (R) : Being more polar, butan-1-ol forms stronger intermolecular hydrogen bonds as compared to butan-1-amine.
Assertion (A) : Acetanilide $\text{(C}_6\text{H}_5\text{NHCOCH}_3\text{)}$ is less basic than aniline.
Reason (R) : Acetylation of aniline results in decrease of electron density on nitrogen.
Assertion (A) : Acetanilide $\text{(NHCOCH}_3\text{)}$ is less basic than aniline.
Reason (R) : Acetylation of aniline results in decrease of electron density on nitrogen.
Assertion (A) : Acetanilide ($\text{NHCOCH}_3$ attached to a benzene ring) is more basic than aniline.
Reason (R) : Acetylation of aniline results in decrease of electron density on nitrogen.
Reduction of aromatic nitro compounds using Sn and HCl gives :
(A) Aromatic amide
(B) Aromatic oxime
(C) Aromatic primary amine
(D) Aromatic hydrocarbon
Methylamine reacts with $\text{HNO}_2$ to form :
(A) $\text{CH}_3 - \text{O} - \text{N} = \text{O}$
(B) $\text{CH}_3 - \text{O} - \text{CH}_3$
(C) $\text{CH}_3 - \text{OH}$
(D) $\text{CH}_3 - \text{CHO}$
Which one of the following has the lowest $\text{pK}_b$ value ?
(A) Ammonia
(B) Aniline
(C) Methylamine
(D) Dimethylamine
Explain the following : (a) Carbylamine reaction (b) Hoffmann bromamide degradation reaction (c) Ammonolysis
Assertion (A) : $-\text{NH}_2$ group is $o$- and $p$-directing in electrophilic substitution reactions. Reason (R) : Aniline cannot undergo Friedel-Crafts reaction.
When Benzene diazonium chloride reacts with phenol, it forms a dye. This reaction is called
(a) Diazotisation reaction
(b) Condensation reaction
(c) Coupling reaction
(d) Acetylation reaction
(a) (I) Give reasons : (i) Aniline on nitration gives good amount of m-nitroaniline, though $-\text{NH}_2$ group is o/p directing in electrophilic substitution reactions. (ii) $(\text{CH}_3)_2 \text{NH}$ is more basic than $(\text{CH}_3)_3\text{N}$ in an aqueous solution. (iii) Ammonolysis of alkyl ...
The Gabriel phthalimide synthesis is used for the preparation of : (a) primary aromatic amines (b) primary aliphatic amines (c) secondary amines (d) tertiary amines
Amines can be considered as derivatives of ammonia obtained by replacement of hydrogen atoms with alkyl or aryl groups. Like ammonia, all the three types of amines have one unshared electron pair on nitrogen atom due to which they behave as Lewis bases. Amines are usually formed from nitro compounds...
Benzene diazonium chloride on hydrolysis gives :
(a) Phenol
(b) Chlorobenzene
(c) Benzene
(d) Aniline
The reaction of ammonia with a large excess of methyl chloride will yield mainly :
(a) methylamine
(b) dimethylamine
(c) tetramethylammonium chloride
(d) trimethylamine
How will you convert the following :
(i) Aniline to p-bromoaniline
(ii) Ethanoic acid to methanamine
(iii) Butanenitrile to 1-aminobutane
Which of the following would not be a good choice for reducing nitrobenzene to aniline ?
(a) $\text{LiAlH}_4$
(b) $\text{H}_2/\text{Ni}$
(c) $\text{Fe}$ and $\text{HCl}$
(d) $\text{Sn}$ and $\text{HCl}$
Amides can be converted into amines by the reaction named
(a) Hoffmann degradation
(b) Ammonolysis
(c) Carbylamine
(d) Diazotisation
Which of the following would not be a good choice for reducing nitrobenzene to aniline?
(a) $LiAlH_4$
(b) $H_2/Ni$
(c) Fe and $HCl$
(d) Sn and $HCl$
Which of the following would not be a good choice for reducing nitrobenzene to aniline ? (a) $\text{LiAlH}_4$ (b) $\text{H}_2/\text{Ni}$ (c) Fe and HCl (d) Sn and HCl
Give the reaction of heating glucose with hydroxylamine. Presence of which group is confirmed by this reaction?
Hoffmann Bromamide Degradation reaction is given by :
(a) $\text{C}_6\text{H}_5\text{NO}_2$ structure
(b) Phthalimide structure
(c) $\text{CH}_3 - \text{C} \equiv \text{N}$
(d) $\text{CH}_3 - \text{CH}_2 - \text{C}(=\text{O}) - \text{NH}_2$
Answer any three of the following questions : Give reasons for the following : (a) Reduction with iron scrap and HCl is preferred for the preparation of amines from nitro compounds. (b) Lower aliphatic amines are soluble in water. (c) Pyridine is used in the acylation reaction of amines. (d) Althoug...
Hoffmann Bromamide Degradation reaction is given by :
(a) A benzene ring with a $NO_2$ group attached.
(b) Phthalimide structure: A benzene ring fused to a five-membered ring containing two carbonyl groups and an $NH$ group.
(c) $CH_3 - C \equiv N$
(d) $CH_3 - CH_2 - \overset{O}{\parallel} C - NH_2$
Answer any three of the following questions : Give reasons for the following : (a) Acylation of $-\text{NH}_2$ group is done in aniline before preparing its ortho and para compounds. (b) Solubility of amines decreases with increase in molar mass of amines. (c) Aniline does not undergo Friedel-Crafts...
Hoffmann Bromamide Degradation reaction is given by :
(a) Nitrobenzene image
(b) Phthalimide image
(c) $\text{CH}_3 - \text{C} \equiv \text{N}$
(d) $\text{CH}_3 - \text{CH}_2 - \overset{\text{O}}{\text{C}} - \text{NH}_2$
Answer any three of the following questions: Give reasons for the following: (a) Diazonium salts of aromatic amines are more stable than aliphatic amines. (b) Amines are less soluble in water as compared to alcohols. (c) How is the basic strength of aromatic amines affected by the presence of an ele...
Vitamin $\text{B}_{12}$ is also called :
(a) Riboflavin
(b) Thiamine
(c) Pyridoxine
(d) Cyanocobalamine
Write the reaction involved in : (a) Hoffmann-bromamide reaction, and (b) Carbylamine reaction
What happens when aniline is treated with (a) $\text{Br}_2$ water ? (b) Conc. $\text{HNO}_3$ ? (c) $\text{CH}_3\text{COCl}$/Pyridine ?
Arrange the following in the increasing order of their boiling points:
A : Butanamine, B: N,N-Dimethylethanamine, C: N- Ethylethanamine
a. C<B<A
b. A<B<C
c. A<C<B
d. B<C<A
Which of the following statements is not correct for amines?
a. Most alkyl amines are more basic than ammonia solution.
b. $\text{pK}_b$ value of ethylamine is lower than benzylamine.
c. $\text{CH}_3\text{NH}_2$ on reaction with nitrous acid releases $\text{NO}_2$ gas.
d. Hinsberg’s reagent reacts w...
Given below are two statements labelled as Assertion (A) and Reason (R)
Assertion (A): Tertiary amines are more basic than corresponding secondary and primary amines in gaseous state.
Reason (R): Tertiary amines have three alkyl groups which cause +I effect.
Select the most appropriate answer from t...
Give reasons for any 3 of the following observations: a. Aniline is acetylated before nitration reaction. b. $pK_b$ of aniline is lower than the m-nitroaniline. c. Primary amine on treatment with benzenesulphonyl chloride forms a product which is soluble in $\text{NaOH}$ however secondary amine give...
(i) Write the IUPAC name for the following organic compound : (CH_3CH_2)_2NCH_3
(ii) Write the equations for the following :
(I) Gabriel phthalimide synthesis
(II) Hoffmann bromamide degradation
(b) (i) Write the IUPAC name for the following organic compound: $(\text{CH}_3\text{CH}_2)_2\text{NCH}_3$ (ii) Write the equations for the following: (I) Gabriel phthalimide synthesis (II) Hoffmann bromamide degradation
A compound ‘A’ on reduction with iron scrap and hydrochloric acid gives compound ‘B’ with molecular formula $\text{C}_6\text{H}_7\text{N}$. Compound ‘B’ on reaction with $\text{CHCl}_3$ and alcoholic $\text{KOH}$ produces an obnoxious smell of carbylamine due to the formation of ‘C’. Identify ‘A’, ‘...
A primary amine 'A' $\text{C}_2\text{H}_7\text{N}$ reacts with alkyl halide ($\text{C}_2\text{H}_5\text{I}$) to give secondary amine 'B'. 'B' reacts with $\text{C}_6\text{H}_5\text{SO}_2\text{Cl}$ to give a solid 'C' which is insoluble in alkali. Identify 'A', 'B', 'C' and write all the chemical rea...
(a) Account for the following :
(i) $ ext{pK}_b$ of aniline is more than that of methylamine.
(ii) Aniline does not undergo Friedel-Crafts reaction.
(iii) Primary amines have higher boiling points than tertiary amines.
OR
(b) (i) Arrange the following compounds in the increasing order of their basic...
(a) An aromatic compound 'A' ($\text{C}_7\text{H}_6\text{O}_2$) on reaction with aqueous ammonia and heating forms compound 'B'. 'B' on heating with $\text{Br}_2$ and alcoholic potash forms a compound 'C' of molecular formula $\text{C}_6\text{H}_7\text{N}$. Write the reactions involved and identify ...
(a) Which of the following is a secondary amine ? $\text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2$, $\text{CH}_3\text{CH}_2\text{NHCH}_2\text{CH}_3$, $\text{CH}_3 - \text{N} - \text{C}_2\text{H}_5 \newline | \newline \text{CH}_3$
(b) Complete the following :
$\text{C}_6\text{H}_5\text{NO}_2 \xrighta...
(a) Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis. Why ?
(b) Aniline is a weaker base than alkyl amines. Why ?
(c) Arrange the following in the increasing order of basic strength in aqueous solution :
$(\text{CH}_3\text{CH}_2)_2\text{NH}, (\text{C}_2\text{H}_5)_3\tex...
(a) Choose the tertiary amine from the following compounds :
$\text{CH}_3\text{NH} - \text{CH} - \text{CH}_3$, $\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{NH}_2$, $\text{CH}_3 - \text{N} - \text{C}_2\text{H}_5$
$\hspace{4.2cm} | \hspace{5.5cm} |$
$\hspace{4.0cm} \text{CH}_3 \hspace{5.1cm} \te...
Write the chemical equations involved when aniline is treated with the following reagents : (Any two)
(i) $\text{CH}_3\text{COCl}$/Pyridine
(ii) $\text{Br}_2$ water
(iii) $\text{HCl}$
(a) Write the reactions involved in the following : (i) Hoffmann bromamide degradation reaction (ii) Gabriel phthalimide synthesis (iii) Carbylamine reaction OR (b) Write the structures of A, B and C in the following : (i) CH_3COOH ->[NH_3][Δ] A ->[LiAlH_4][H_2O] B ->[HNO_2][0^°C] C (ii) C_6H_5NO_2 ...
Arrange the following compounds in the increasing order of their property indicated : (Any two)
(i) Aniline, $\text{CH}_3 - \text{NH}_2$, p-nitroaniline (Basic strength)
(ii) $\text{C}_6\text{H}_5\text{NH}_2$, $\text{C}_6\text{H}_5\text{NHCH}_3$, $\text{C}_6\text{H}_5\text{CH}_2\text{NH}_2$ (Basic s...
(a) (i) Why does aniline not give Friedel-Crafts reaction?
(ii) Write the equation involved in carbylamine reaction.
(iii) Write the structures of A and B in the following :
(Benzene ring)-$ ext{CONH}_2 \xrightarrow{ ext{Br}_2 + ext{KOH (aq.)}} ext{A} \xrightarrow{( ext{CH}_3 ext{CO})_2 ext{O} / ...