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

The correct option is D CH3Cl>CH3CH2Cl>(CH3)2CHCl>(CH3)3CCl
Rate of SN2 reaction 1stericovercrowdingintransitionstate

So, the reactivity of CH3Cl will be the most.

And as the steric hinderance increases rate of SN2 will decrease. And hinderance increases with crowding on the central atom.

Hence the correct order is option D.

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