Identify the two reactions $A(\mathrm{I} \rightarrow \mathrm{II})$ and $B(\mathrm{I} \rightarrow \mathrm{III})$ respectively in the following set of reactions.

Which of the following will undergo methylation with $\mathrm{CH}_3 \mathrm{Cl}$ /anhy. $\mathrm{AlCl}_3$ ?

I. Aniline

II. Chlorobenzene

III. Benzoic acid

IV. Anisole

Which one of the following halogen compounds is least reactive towards hydrolysis by $\mathrm{S}_{\mathrm{N}} 1$ mechanism?

$p$-chlorotoluene is the major product in which of the following reactions?