Which of the following will give $N_2$ gas on treatment with nitrous acid?

In the following sequence $CH_3CH_2Cl$ $\xrightarrow{NaCN} (i)$ $\xrightarrow{Ni/H_2} (ii)$ $\xrightarrow{\text{acetic anhydride}} (iii)$,Product $(iii)$ is

In the chemical reactions,the compounds $A$ and $B$ respectively are

In the given reaction,$A$ will be:
$\text{Cyclopropylmethylamine} \xrightarrow{HNO_2} (A) + \text{cyclobutanol} (47\%) + \text{but-3-en-1-ol} (5\%)$

Identify compound $X$ in the following reaction.

Which of the following products is $NOT$ obtained when nitrobenzene is reduced in an alkaline medium?