$Ph-NH_2$ $\xrightarrow[Br_2]{HNO_2} A$ $\xrightarrow[Warm]{H_2O} B$
$B$ is

Predict the reagents or products $(1)$ to $(5)$ in the following reaction sequence:
$p-Nitrotoluene$ $\xrightarrow{(1)} p-Toluidine$ $\xrightarrow{(CH_3CO)_2O/\text{Pyridine}} p-Acetotoluidide$ $\xrightarrow{HNO_3/H_2SO_4} (2)$ $\xrightarrow{(3)} (4)$ $\xrightarrow{(5)} 3-Nitrotoluene$

In the reaction $RNH_2 + CHCl_3 + 3KOH(alc.) \rightarrow A + 3KCl + 3H_2O$,the product $A$ can be converted back to $RNH_2$ by which process?

$CH_3NH_2 + CHCl_3 + 3KOH \rightarrow X + Y + 3H_2O$;
Compounds $X$ and $Y$ are:

Which one of the following will give a primary amine on hydrolysis?

Aniline in a set of the following reactions yielded a coloured product $Y$.
Aniline $\xrightarrow[(273-278 \ K)]{NaNO_{2}/HCl} X$ $\xrightarrow{N,N-dimethylaniline} Y$
The structure of $Y$ would be