question_answer

Chlorination of benzene in the presence of halogen carrier is an example of

A)  aromatic nucleophilic substitution

B)  aromatic electrophilic substitution

C)  aromatic nucleophilic addition

D)  aromatic electrophilic addition

E)  free radical substitution

Correct Answer: B

Solution :

The chlorination of benzene in the presence of halogen carrier (ie, Lewis acid) is an example of aromatic electrophilic substitution. Mechanism of chlorination is as follows \[Cl-Cl+\underset{(ha\log en\text{ }carrier)}{\mathop{FeC{{l}_{3}}}}\,\xrightarrow{{}}\underset{(electrophile)}{\mathop{C{{l}^{+}}}}\,\]\[+\text{ }FeCl_{4}^{-}\]