Which of the following has the highest melting point?

In which of the following is the chlorine atom least reactive towards nucleophilic substitution?

What is the intermediate compound formed when chlorobenzene is treated with fused $NaOH$ under pressure?

The major products formed in the following reaction sequence are:
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$A$ and $B$ respectively are:

"The presence of an electron-withdrawing group $\left( -NO_2 \right)$ at the ortho and para positions in haloarenes increases the reactivity of haloarenes towards nucleophilic substitution reactions." Prove this with an example.

Which of the following groups exerts a strong deactivating effect on an aromatic ring?