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Solution


Q.

The correct order of reactivity in electrophilic substitution reaction of the following compounds is:               [2024]
1 D > C > B > A  
2 B > C > A > D  
3 A > B > C > D  
4 B > A > C > D  

Ans.

(4)

Reactivity of the benzene ring towards an electrophile is directly proportional to electron density on the ring.

–CH3 supplies electrons to benzene by its hyperconjugation and +I effect.

–Cl Has +M effect and –I effect. The –I effect of –Cl is more than its +M effect. Hence, –Cl decreases electron density on benzene and reduces its reactivity towards electrophilic substitution reactions.

–NO2 Has –M and –I effect.