Which one of the following reactions proceeds through free radical chain mechanism?

Addition of

H B r

on ethene

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Halogenation of benzene in the presence of

F e {B r}_{3}

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Photochemical chlorination of methane

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Hydrolysis of tert-butyl chloride with aqueous

K O H

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Addition of

N a H S O_{3}

on acetone

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Solution

The correct option is A Photochemical chlorination of methane

Reaction Mechanism followed
(a) Addition of $H B r$ on ethene Ionic addition reaction
(b) Halogenation of benzene in the presence of $F e {B r}_{3}$ Electrophilic substitution reaction
(c) Photochemical chlorination of methane Free radical substitution
(d) Hydrolysis of tert-butylchloride with aqueous $K O H$ Nucleophilic substitution
(e) Addition of $N a H S O_{3}$ on acetone Nucleophilic addition
Thus, photochemical chlorination of methane proceeds via free radical chain mechanism.

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	Reaction	Mechanism followed
(a)	Addition of $H B r$ on ethene	Ionic addition reaction
(b)	Halogenation of benzene in the presence of $F e {B r}_{3}$	Electrophilic substitution reaction
(c)	Photochemical chlorination of methane	Free radical substitution
(d)	Hydrolysis of tert-butylchloride with aqueous $K O H$	Nucleophilic substitution
(e)	Addition of $N a H S O_{3}$ on acetone	Nucleophilic addition