Assertion :polar solvent slows down $S_{N^{2}}$ reaction. Reason: $C H_{3} - B r$ is less reactive than $C H_{3} C l$ .

Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion

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Both Assertion and Reason are incorrect but the Reason is not the correct explanation of the Assertion

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The Assertion is correct but the Reason is incorrect

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The Assertion is incorrect but the Reason is correct

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Solution

The correct option is C The Assertion is correct but the Reason is incorrect
polar solvent slows down $S_{N} 2$ reaction.
Because the nucleophile is solvated and not free for the attack.
Hence $S_{N} 2$ reactions are favored by polar aprotic solvents and non-polar or low polarity solvents.
$C H_{3} - B r$ is more reactive than $C H_{3} C l$ as the bond dissociation energy for $C - B r$ bond is lower than the bond dissociation energy for $C - C l$ bond.
Hence, Assertion is correct but the Reason is incorrect.

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Assertion :polar solvent slows down SN2 reaction. Reason: CH3−Br is less reactive than CH3Cl.

Assertion :polar solvent slows down $S_{N^{2}}$ reaction. Reason: $C H_{3} - B r$ is less reactive than $C H_{3} C l$ .