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Question

Consider two alternative mechanism for the chlorination of methane. Which step is crucial in deciding which mechanism is not likely to be observed?
Mechanism I Mechanism II

A Cl22Cl
A Cl22Cl
B Cl+CH4HCl+CH3
D Cl+CH4CH3Cl+H
C CH3+Cl2CH3Cl+Cl
E H+Cl2HCl+Cl

A
A
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B
B
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C
C
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D
D
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Solution

The correct option is B B
According to the reaction, step B is crucial and it will tell whether mechanism is possible or not.

1. Initial reaction
Cl2hν2Cl

2. Chain propagation
Cl+CH4HCl+CH3
CH3+Cl2CH3Cl+Cl

3. Chain termination reactions
Cl+ClCl2
CH3+CH3CH3CH3
Cl+CH3CH3Cl

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