Explanation

(a)
Hofmann bromamide reaction is used to prepare 1${^\circ}$ amine form primary amides. In this method, amides are treated with bromine in presence of KOH.
$R - CONH_{2} + 4KOH + Br_{2}\overset{\mathrm{\Delta}}{\rightarrow}RNH_{2} + K_{2}CO_{3} + 2KBr + 2H_{2}O$