When acetamide reacts with $Br_2$ and caustic soda,then we get

Consider the following sequence of reactions. Identify $A, B, C$.

Identify the product obtained when $RCN$ is treated with sodium and alcohol.

An aromatic compound $A$ having molecular formula $C_7H_6O_2$ on treating with aqueous ammonia and heating forms compound $B$. The compound $B$ on reaction with molecular bromine and potassium hydroxide provides compound $C$ having molecular formula $C_6H_7N$. The structure of $A$ is

The starting material that produces pentanamine by the Hoffmann bromamide reaction is

Acetamide is treated separately with the following reagents. Which would give methyl amine?