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(C) In electrophilic aromatic substitution reactions of chlorobenzene,the $ortho/para$-directing ability of chlorine is due to its $+R$-effect.Chlorin

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positive resonance effect $(+R)$

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(C) In electrophilic aromatic substitution reactions of chlorobenzene,the $ortho/para$-directing ability of chlorine is due to its $+R$-effect.Chlorine has lone pairs of electrons that can be delocalized into the benzene ring through resonance.The resonating structures of chlorobenzene are as follows:Due to this effect,the electron density increases more at $ortho$ and $para$-positions than at $meta$-position,making these positions more susceptible to electrophilic attack.

In electrophilic aromatic substitution reactions of chlorobenzene,the $ortho/para$-directing ability of chlorine is due to its

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