Appeared in: 2026 (2 sets)
(b) (i) Draw the structure of the semicarbazone of acetone.
(ii) Why are $\alpha$-hydrogen atoms of aldehydes and ketones acidic in nature ?
(iii) Arrange the following compounds in increasing order of their reactivity towards $\text{HCN}$ :
$\text{CH}_3\text{COCH}_3, \text{CH}_3\text{CHO}, (\text{CH}_3)_3\text{C}-\text{C}-\text{CH}_3$
$\parallel$
$\text{O}$
(iv) Write the reaction involved in Etard reaction.
(v) Write the product when cyclohexanecarbaldehyde reacts with $\text{Zn}(\text{Hg})/\text{conc. HCl}$.