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Q.

Cis $2 - butene + KMn O_{4} \to_{273 K}^{KOH} product$

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a

Meso 2,3–butane diol

b

Dextro 2,3–butane diol

c

Racemic mixture of 2 & 3

d

Laevo 2,3–butanediol

answer is A.

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Detailed Solution

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cis-2-Butene on reaction with cold dilute KMnO₄ solution produces meso2,3butanediol.
It is dihydroxylation reaction and two -OH groups are added across C=C bond.

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