Arrange the following compounds in increasing order of rate of reaction towards nucleophilic substitution.

I < I I < I I I

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I I < I < I I I

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I I I < I I < I

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I < I I I < I I

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Solution

The correct option is D $I I I < I I < I$
The increasing order of rate of reaction towards nucleophilic substitution is $I < I I < I I I$ . Methyl group (in general) increases the electron density on ortho and para positions due to combination of inductive effect (+I effect) and hyperconjugation. This effect is more when the number of methyl groups increases. This effect decreases the rate of reaction towards nucleophilic substitution.

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