Which of the following cannot be considered as a mechanistic step in chain reaction of methane with $C l_{2}$ ?

C l_{2} \to C l^{*}

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C H_{4} + C l^{*} \to C H_{3} C l + H^{*}

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C l^{*} + C H_{4} \to C H_{3}^{*} + H C l

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C l^{*} + C H_{3}^{*} \to C H_{3} C l^{*}

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Solution

The correct option is B $C H_{4} + C l^{} \to C H_{3} C l + H^{}$
Mechanism of chlorination of methane:

Chain initiation step: $C l_{2} h ν - \to 2 C l^{}$

Chain propagation step: $C H_{4} + C l^{} \to C H_{3}^{} + H C l$

Chain termination step: $C l^{} + C H_{3}^{} \to C H_{3} C l$

So, the step not involved in the mechanism of chlorination of methane is $C H_{4} + C l^{} \to C H_{3} C l + C l^{*}$

Hence, Option "B" is the correct answer.

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{C l}_{2}

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