Q.

In which of the following homolytic bond fission takes place?

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a

Free radical chlorination of methane

b

Addition of HBr to double bond

c

Alkaline hydrolysis of ethyl chloride

d

Nitration of Benzene

answer is A.

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Detailed Solution

Homolytic bond fission occurs during the chlorination of methane by free radicals. Two atoms share a bond pair of electrons equally, with each receiving one electron, resulting in the formation of radicals.
All other reactions that have been given have used an ionic mechanism.
Thus (A) Free radical chlorination of methane is the correct answer. 

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