The product $(A)$ is:

Identify $A$ and $B$ in the following reactions:

Identify $X$ and $Y$ in the following reactions:

Arrange the following in order of their decreasing acidic strength:
$(I)$ $CH_3NH_3^+$
$(II)$ $C_6H_5NH_3^+$
$(III)$ $[H_2N-C(=NH)-NH_2]H^+$
$(IV)$ $O_2N-C_6H_4-NH_3^+$

Identify the product $(Y)$ in the following reaction sequence:
$C_6H_5NH_2$ $\xrightarrow{CHCl_3, KOH, \Delta} X$ $\xrightarrow{LiAlH_4, H_2O} Y$

Identify $R$ in the following sequence of reaction: