Which of the following will be the fastest reaction.

C H_{3} - C H_{3} C l_{2} / h v - --- \to

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C H_{3} - C H_{2} - C H_{3} B r_{2} / h v - --- \to

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P h - C H_{2} - C H_{3} C l_{2} / h v - --- \to

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C H_{3} - C H_{2} - C H_{3} C l_{2} / h v - --- \to

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Solution

The correct option is C $P h - C H_{2} - C H_{3} C l_{2} / h v - --- \to$
Reaction (c) will be fastest since, the benzyl radical formed will be stable due to resonance.

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