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Question

The decreasing order of rate of SN2 reaction for given compounds is:

CH3Cl CH3C||OCH2Cl CH3CH|CH3CH3Cl CH3CH2Cl
(I) (II) (III) (IV)

A
IV>III>II>I
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B
II>III>I>IV
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C
II>I>IV>III
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D
none
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Solution

The correct option is C II>I>IV>III
SN2 is a type of Nucleophilic Substitution Reaction which is completed in general step.
Factors for the rate of SN2 reaction mainly include steric hindrance.
But in the given compounds, compound (II) has an additional inductive effect because of CO group, so, it has the fastest rate.
By considering steric hindrance, (I)>(IV)>(III) is placed, as they are in the order of less to more sterically hindered.
So, the answer is (II)>(I)>(IV)>(III).

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