Assertion :Treatment of cis- $2$ -butene with cold,dilute and alkaline $K M n O_{4}$ solution gives a meso- $2, 3$ -butanediol. Reason: $M n O_{4}^{-}$ forms a cyclic intermediate with alkene.

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

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A meso compound is a molecule with multiple stereocenters that is superimposable on its mirror image.

Assertion - Treatment of cis- $2$ -butene with cold, dilute and alkaline $K M n O_{4}$ solution gives a meso-2,3-butanediol. This statement is true.

Reason - $M n O_{4}^{-}$ forms a cyclic intermediate with alkene. This statement is true.
Formation of cyclic intermediate restricts rotation and switching of $- C H 3$ and $- O H$ groups which is why plane of symmetry exists. So both statements are correct and reason is correct explanation of assertion.

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