Although chlorobenzene does not undergo the Ullmann reaction,the presence of which group at the $o-$ and $p-$ positions of chlorobenzene makes it possible to undergo the Ullmann reaction?

In a reaction of $C_6H_5Y$,the major product obtained is the $60\%$ isomer. What is the group $Y$?

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?

When $C_6H_5Cl$ is heated with $NaOH$ at $300 \, ^\circ C$ under pressure,phenol is obtained. However,the yield is low because a side reaction produces ...............

The reaction between chlorobenzene and chloral in the presence of concentrated sulphuric acid produces $:$

Nitration of phenyl benzoate yields the product