The diazonium salts are the reaction products in the presence of excess of mineral acid with nitrous acid and:

In the reaction sequence $CH_3CONH_2$ $\xrightarrow{?} CH_3CN$ $\xrightarrow{\text{reduction}} CH_3CH_2NH_2$,which dehydrating agent is used in the first step?

Which compound gives ethanamine upon heating with $[KOH + Br_2]$?

Identify product $B$ obtained in the following reaction: $CH_{3}CH_{2}NO_{2}$ $\xrightarrow[\Delta]{HNO_{2}} A$ $\xrightarrow{LiAlH_{4}} \text{ether} B$

An aromatic compound '$A$' on treatment with aqueous ammonia and heating forms compound '$B$',which on heating with $Br_2$ and $KOH$ forms a compound $C$ of molecular formula $C_6H_7N$. The structures of compound $A, B$ and $C$ are respectively:

When acetamide is treated with $Br_{2}$ and caustic soda,the product formed is