Write the nucleophilic substitution reactions of $Cl^-$ in $C-Cl$ bond of haloarenes with $OH^-$.

(N/A) The nucleophilic substitution of haloarenes is difficult due to the partial double bond character of the $C-Cl$ bond. However,it can be facilitated by harsh conditions or by the presence of electron-withdrawing groups $(NO_2)$ at ortho and para positions.
$(i)$ Chlorobenzene to Phenol: Requires $NaOH_{(aq)}$,$623 \ K$,and $300 \ atm$ pressure followed by acidification $(H^+)$.
$(ii)$ $p-$Nitrochlorobenzene to $p-$Nitrophenol: Requires $NaOH$ at $443 \ K$ followed by acidification $(H^+)$.
$(iii)$ $2,4-$Dinitrochlorobenzene to $2,4-$Dinitrophenol: Requires $NaOH$ at $368 \ K$ followed by acidification $(H^+)$.