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Solution


Q.

Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is ______.            [2024]

Ans.

(2)

-M groups decrease electron density on aromatic ring hence act as deactivating groups in electrophilic aromatic substitution reactions. Groups of the type –X=Y and –X≡Y act as –M groups. Among given options –COOCH3 and –C≡N are –M groups, thus acts as deactivating groups.

–NHCOCH3, –NHCH3 and –OCH3 are +M groups hence act as activating groups for electrophilic aromatic substitution reactions. +M groups have a lone pair of electrons on first atom.