Which catalyst is used in the Friedel-Crafts reaction?

Consider the reaction of $1-chloro-2-hydroxy-4-nitrobenzene$ with $OH^-$ followed by $H^+$. Based on the above reaction,the major product $P$ would be:

If $B$ is the major product,then identify $B$.

Which has maximum dipole moment?

Why are aryl halides less reactive towards nucleophilic substitution reactions than alkyl halides? How can we enhance the reactivity of aryl halides?

Explain the mechanism of nucleophilic substitution reaction of $m$-nitrochlorobenzene at ortho and para positions.