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Which one of the following is a free-radical substitution reaction?

1. CH3CHO + HCN → CH3CH(OH)CN
2. CH3Cl + Cl2 → CH3Cl2
3. CH3Cl + Anhydrous AlCl3 → CH3
4. CH3Cl + AgNO2 → CH3NO2

Correct answer: CH3Cl + Cl2 → CH3Cl2

Solution

The reaction CH3Cl + Cl2 → CH3Cl2 involves the substitution of a hydrogen atom in CH3Cl by a chlorine atom through a free-radical mechanism initiated by UV light.

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