Question

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

Answer 1

Answer: (B)

aromatic electrophilic substitution

Answer 2

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
$Cl-Cl+\underset{(ha\log en\text{ }carrier)}{\mathop{FeC{{l}_{3}}}}\,\xrightarrow{{}}\underset{(electrophile)}{\mathop{C{{l}^{+}}}}\,$ $+\text{ }FeCl_{4}^{-}$