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(B) The reactivity of aryl halides towards nucleophilic substitution increases with the presence of electron-withdrawing groups (like $-NO_2$) at the

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$(III)$ > $(II)$ > $(I)$

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(B) The reactivity of aryl halides towards nucleophilic substitution increases with the presence of electron-withdrawing groups (like $-NO_2$) at the $o-$ and $p-$positions.These groups stabilize the carbanion intermediate formed during the reaction through resonance.Compound $(I)$ has one $-NO_2$ group at the $p-$position.Compound $(II)$ has two $-NO_2$ groups (one at $o-$ and one at $p-$position).Compound $(III)$ has three $-NO_2$ groups (two at $o-$ and one at $p-$position).As the number of electron-withdrawing groups increases,the stability of the intermediate increases,thereby increasing the reactivity.Therefore,the correct order of reactivity is $(III) > (II) > (I)$.

Aryl halides are extremely less reactive towards nucleophilic substitution. Predict and explain the order of reactivity of the following compounds towards nucleophilic substitution:
$(I)$ $p$-nitrochlorobenzene
$(II)$ $2,4$-dinitrochlorobenzene
$(III)$ $2,4,6$-trinitrochlorobenzene

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Aryl halides are extremely less reactive towards nucleophilic substitution. Predict and explain the order of reactivity of the following compounds towards nucleophilic substitution:$(I)$ $p$-nitrochlorobenzene$(II)$ $2,4$-dinitrochlorobenzene$(III)$ $2,4,6$-trinitrochlorobenzene