In the following reaction,the major product is:

Nitrobenzene on nitration gives

The following reaction is:
$p-Nitrochlorobenzene + KOH \xrightarrow{\Delta} p-Nitrophenol + KCl$

Chlorobenzene $(X)$ when reacted with reagent '$A$' gets converted to phenol $(Y)$. The major product obtained from nitration of $X$ gets converted to $p$-nitrophenol $(Z)$ by reaction with reagent $B$. What are $A$ and $B$ respectively?

Describe the reaction of chlorobenzene with a hydroxyl group (nucleophilic substitution).

$p-$Nitrobromobenzene can be converted to $p-$nitroaniline by using $NaNH_2$. The reaction proceeds through the intermediate named