Which of the above reaction will go faster if the concentration of the nucleophile is raised?

I and III

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II and IV

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I and II

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I, II and IV

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Solution

The correct option is C I and II
Answer: c
Explanation: I & II reaction undergo via $S N_{2}$ mechanism. III & IV reaction undergo via $S N_{1}$ mechanism. As we know the rate of reaction in $S N_{2}$ reaction is directly proportional to the concentration of nucleophile.

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