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Question

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

A
Addition of HBr on ethene
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B
Halogenation of benzene in the presence of FeBr3
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C
Photochemical chlorination of methane
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D
Hydrolysis of tert-butyl chloride with aqueous KOH
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E
Addition of NaHSO3 on acetone
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Solution

The correct option is A Photochemical chlorination of methane

Reaction Mechanism followed
(a)Addition of HBr on etheneIonic addition reaction
(b)Halogenation of benzene in the presence of FeBr3Electrophilic substitution reaction
(c)Photochemical chlorination of methaneFree radical substitution
(d)Hydrolysis of tert-butylchloride with aqueous KOHNucleophilic substitution
(e)Addition of NaHSO3 on acetoneNucleophilic addition
Thus, photochemical chlorination of methane proceeds via free radical chain mechanism.

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