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(B) The reactivity of haloarenes towards nucleophilic substitution depends on the presence of electron-withdrawing groups $(EWG)$ at the $ortho$ and $

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$m-$Nitrochlorobenzene

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(B) The reactivity of haloarenes towards nucleophilic substitution depends on the presence of electron-withdrawing groups $(EWG)$ at the $ortho$ and $para$ positions.These groups stabilize the carbanion intermediate formed during the reaction.An $EWG$ at the $meta$ position has practically no effect on the reactivity because the negative charge in the intermediate does not reside on the carbon atom attached to the $meta$ position.Therefore,$m-$nitrochlorobenzene has the least reactivity,making it the most difficult to break the $C-Cl$ bond among the given options.

Which of the following compounds has the most difficulty in breaking the $C-Cl$ bond?

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