Which of the following compounds gives the smell of mustard oil?

Nitrobenzene gives $N$-phenylhydroxylamine by

What is the correct order of basicity for the substituted anilines ($I$ to $IV$)?

Give uses of amine compounds as medicines.

$C_2H_5Cl$ $\xrightarrow{KCN} X$ $\xrightarrow{H_2 / \text{Catalyst}} Y$ $\xrightarrow{CHCl_3 / KOH} Z$
What is '$Z$' in the above sequence of reactions?

Nitration of aniline in a strong acidic medium also gives $m$-nitroaniline because