Total number of deactivating groups in aromat | vedclass

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(B) In aromatic electrophilic substitution reactions,groups that withdraw electron density from the benzene ring are called deactivating groups. These

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$2$

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(B) In aromatic electrophilic substitution reactions,groups that withdraw electron density from the benzene ring are called deactivating groups. These typically exhibit a $-M$ (negative mesomeric) or $-I$ (negative inductive) effect.Let us analyze the given groups:$1$. $-COOCH_3$: This group has a carbonyl group attached to the ring,which exerts a $-M$ effect. It is a deactivating group.$2$. $-NHCOCH_3$: The nitrogen atom has a lone pair that can be donated to the ring via resonance ($+M$ effect). It is an activating group.$3$. $-NHCH_3$: The nitrogen atom has a lone pair that can be donated to the ring via resonance ($+M$ effect). It is an activating group.$4$. $-CN$: The cyano group has a triple bond between carbon and nitrogen,exerting a strong $-M$ effect. It is a deactivating group.$5$. $-OCH_3$: The oxygen atom has lone pairs that can be donated to the ring via resonance ($+M$ effect). It is an activating group.The deactivating groups are $-COOCH_3$ and $-CN$.Therefore,the total number of deactivating groups is $2$.

Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is:
$-COOCH_3$,$-NHCOCH_3$,$-NHCH_3$,$-CN$,$-OCH_3$

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Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is:$-COOCH_3$,$-NHCOCH_3$,$-NHCH_3$,$-CN$,$-OCH_3$