Which of the following reagents is used to convert a $-CN$ group to a $-CH_2NH_2$ group?

The conversion of $C_6H_5CONHCH_3$ to $C_6H_5CH_2NHCH_3$ can be carried out by using:

$Acetamide$ changes into $methylamine$ by:

Which of the following reactions are used in the preparation of aliphatic primary amines?
$I$. Gabriel-phthalimide reaction
$II$. Hoffmann Bromamide reaction
$III$. Carbylamine reaction
$IV$. Sandmeyer reaction

Identify $X$ and $Y$ in the following sequence:
$C_2H_5Br$ $\xrightarrow{X} \text{product}$ $\xrightarrow{Y} C_3H_7NH_2$

An organic compound $A$ upon reacting with $NH_3$ gives $B$. On heating $B$ gives $C$. $C$ in presence of $KOH$ reacts with $Br_2$ to give $CH_3CH_2NH_2$. $A$ is: