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arun-rashi (1128)

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You shud keep this in mind that IN INDUCTIVE EFFECT there is just displacement of electrons & no transfer takes place but in RESONANCE EFFECT there is transfer of electrons through resonance, only possible if atom of thesubstituent, whichis directly attached to benzene ring contains a lone pair .Thus in case of chlorobenzene resonance creates negative charge at o &p position &negative inductive effect makes ring electron deficient making attack of electrophile difficult(in comparision yo benzene ) & thus become deactivating group

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