question_answer

In which of the following polysubstitution takes place?

A)

B)

C)

D)

Correct Answer: B

Solution :

[b] Since \[C{{H}_{3}}\]group is electron donating. Therefore electron density in toluene is higher than in benzene and hence poly substitution occurs during F.C alkylation when benzene ring contain electron donating groups. All other groups \[(i.e\,C{{H}_{3}}CO,N{{O}_{2}}\,and\,S{{O}_{3}}H)\]are electron withdrawing and hence poly substitution does not occur.