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Question: In halogenations of aromatic hydrocarbon, a halogen carrier is used which is generally a lewis acid....

In halogenations of aromatic hydrocarbon, a halogen carrier is used which is generally a lewis acid. The main function of this reagent is to generate the species.

A

X

B

X−\mathrm { X } ^ { - }

C

D

X∙\mathrm { X } ^ { \bullet }

Answer

Explanation

Solution

: Halogen carrier generates an elecrtrophile with the help of halogen e.g. during chlorination Cl+\mathrm { Cl } ^ { + } is generated.

AlCl3+Cl2→AlCl4−+Cl+\mathrm { AlCl } _ { 3 } + \mathrm { Cl } _ { 2 } \rightarrow \mathrm { AlCl } _ { 4 } ^ { - } + \mathrm { Cl } ^ { + }

Or AlX3+X2→Alx4+X+\mathrm { AlX } _ { 3 } + \mathrm { X } _ { 2 } \rightarrow \mathrm { Alx } _ { 4 } + \mathrm { X } ^ { + }