Why is $m$-dinitrobenzene obtained from $C_6H_5NO_2$?

$(i)$ chlorobenzene is mono-nitrated to $M$.
$(ii)$ nitrobenzene is mono-chlorinated to $N$.
$(iii)$ anisole is mono-nitrated to $P$.
$(iv)$ $2-$nitrochlorobenzene is mono-nitrated to $Q$.
Out of $M$,$N$,$P$ and $Q$,the compound that undergoes reaction with $aq. NaOH$ fastest is:

Which of the following groups deactivates the benzene ring towards electrophilic substitution reaction?

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

$C_6H_6$ $\xrightarrow[\text{Conc. } H_2SO_4]{\text{Conc. } HNO_3} B$ $\xrightarrow{\text{Sn + HCl}} C$ $\xrightarrow[0-5^\circ C]{HNO_2} D$ $\xrightarrow{HBF_4} E$ $\xrightarrow{\Delta} F$
$F$ will be

Identify the position where the nucleophilic attack of $(ArO^{-})$ is most favourable in the given molecule.