The reaction $CH_3CONH_2 \xrightarrow{NaOBr}$ gives:

The major product is:

Identify $A$ and $B$ in the following reaction.

Which of the following compounds reacts with $KOH$ and $Br_2$ to form ethylamine?

$N$-Ethylphthalimide on hydrolysis gives:

In the preparation of a $1^{\circ}$-amine from an alkyl halide,with simultaneous addition of one $-CH_2-$ group to the carbon chain,the reagent used as the source of nitrogen is