The compound that reacts the fastest with sodium methoxide is

Given below are two statements:
Statement $I$: Benzene is nitrated to give nitrobenzene,which on further treatment with $CH_{3}COCl / AlCl_{3}$ will give the product shown in the image.
Statement $II$: $NO_{2}$ group is a $m$-directing and deactivating group.
In the light of the above statements,choose the most appropriate answer:

The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :-
$(i)$ Chlorobenzene
(ii) $p$-Nitrochlorobenzene
(iii) $2,4$-Dinitrochlorobenzene
(iv) $2,4,6$-Trinitrochlorobenzene

Identify the incorrect match in the following reactions:

Number of compounds from the following which cannot undergo Friedel-Crafts reactions is ............ toluene,nitrobenzene,xylene,cumene,aniline,chlorobenzene,$m$-nitroaniline,$m$-dinitrobenzene

Which of the following is least reactive towards $S_{N}1$ reaction?