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In S_N2 reactions, the correct order of reactivity for the following compounds: CH3Cl, CH3CH2Cl, (CH3)2CHCl and (CH3)3CCl is

1. CH3Cl > CH3CH2Cl > (CH3)2CHCl > (CH3)3CCl
2. CH3CH2Cl > CH3Cl > (CH3)2CHCl > (CH3)3CCl
3. (CH3)2CHCl > CH3CH2Cl > CH3Cl > (CH3)3CCl
4. CH3Cl > (CH3)2CHCl > CH3CH2Cl > (CH3)3CCl

Correct answer: CH3Cl > CH3CH2Cl > (CH3)2CHCl > (CH3)3CCl

Solution

In S_N2 reactions, the reactivity order is influenced by steric hindrance; primary alkyl halides like CH3Cl react more readily than secondary and tertiary ones due to less steric crowding, making it easier for the nucleophile to attack the carbon atom.

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