(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) $\text{CH}_3\text{CH}_2\text{Cl} \xrightarrow{\text{KCN}} \text{A} \xrightarrow{\text{LiAlH}_4} \text{B} \xrightarrow{\text{HNO}_2}{0 ^\circ\text{C}} \text{C}$ (ii) $\text{CH}_3\text{COOH} \xrightarrow{\text{NH}_3}{\Delta} \text{A} \xrightarrow{\text{(a) LiAlH}_4}{\text{(b) H}_2\text{O}} \text{B} \xrightarrow{\text{C}_6\text{H}_5\text{SO}_2\text{Cl}} \text{C}$