Give the mechanism of chlorination of methane.

1.	Give the mechanism of chlorination of methane.
Answer» It is a free radical chain reaction. 1. Chain initiation: Chlorine molecule undergoes hemolytic fission in the presence of diffused sunlight to form chlorine free radicals. Cl₂ → 2Cl 2. Chain propagation: The chlorine free radical abstracts a hydrogen atom from a methane molecule to form methyl free radical. CH₄ + Cl → CH3 . + HCl Methyl radical combine with another Cl₂ molecule forming chloromethane. 3. Chain termination: It stops when two radicals combine to form a stable covalent molecule. CH₃ + Cl → CH₃Cl CH₃ + CH₃ → CH₃-CH₃ Cl + Cl → Cl₂

Answer»

It is a free radical chain reaction.

1. Chain initiation: Chlorine molecule undergoes hemolytic fission in the presence of diffused sunlight to form chlorine free radicals.

Cl₂ → 2Cl

2. Chain propagation: The chlorine free radical abstracts a hydrogen atom from a methane molecule to form methyl free radical.

CH₄ + Cl → CH3 . + HCl

Methyl radical combine with another Cl₂ molecule forming chloromethane.

3. Chain termination: It stops when two radicals combine to form a stable covalent molecule.

CH₃ + Cl → CH₃Cl

CH₃ + CH₃ → CH₃-CH₃

Cl + Cl → Cl₂

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