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Question

In SN2 reactions, the correct order of reactivity for the following compounds:
CH3Cl,CH3CH2Cl,(CH3)2CHCl and (CH3)3CCl is:

A
CH3Cl>(CH3)2CHCl>CH3CH2Cl>(CH3)3CCl
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B
CH3Cl>CH3CH2Cl>(CH3)2CHCl>(CH3)3CCl
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C
CH3CH2Cl>CH3Cl>(CH3)2CHCl>(CH3)3CCl
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D
(CH3)2CHCl>CH3CH2Cl>CH3Cl>(CH3)3CCl
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Solution

The correct option is B CH3Cl>CH3CH2Cl>(CH3)2CHCl>(CH3)3CCl
Steric congestion around the carbon atom undergoing the inversion process will slow down the SN2 reaction. hence the less congestion faster will the reaction. So, the order is
CH3Cl>CH3CH2Cl>(CH3)2CHCl>(CH3)3CCl

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