The compounds $P$,$Q$,and $S$ were separately subjected to nitration using $HNO_3 / H_2SO_4$ mixture. The major product formed in each case respectively,is

The correct order of reactivity for the reaction involving the cleavage of the $C-X$ bond in the following compounds is:

The major product for the above reaction is:

Aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions due to:

Which of the following compounds will undergo Friedel-Crafts alkylation with $CH_3Cl$ / anhydrous $AlCl_3$?
$(a)$ Benzoic acid
$(b)$ Chlorobenzene
$(c)$ Aniline
$(d)$ Anisole

Two statements are given below:
Statement $I$: Chlorobenzene on nitration gives $1-$chloro$-4-$nitrobenzene as the major product.
Statement $II$: Chlorobenzene undergoes nitration more slowly than benzene.
Identify the correct answer.