cis-2-Butene on reaction with cold dilute $K M n O_{4}$ solution produces:

meso-2,3-butanediol

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2,3-butanediol

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2, 3-butanedione

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1,2-butanediol

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Solution

The correct option is A meso-2,3-butanediol
cis-2-Butene on reaction with cold dilute $K M n O_{4}$ solution produces meso2,3butanediol.It is dihydroxylation reaction and two -OH groups are added across C=C bond.

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When 3, 3-dimethyl-2-butanol is heated with $H_{2} S O_{4}$ the major product obtained is

C H_{3} - C H C l - C H C l - C H_{3} N a I - ------ \to A c e t o n e, △ 2 - B u t e n e

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