Which of the following epoxide is formed when $K O H$ is added to the optically active halohydrin shown above?

t r a n s - (2 S, 3 S)

-2,3-dimethyl oxirane

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2,2-dimethyl oxirane

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t r a n s - (2 R, 3 R)

-2,3-dimethyl oxirane

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m e s o

-2,3-dimethyl oxirane

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Solution

The correct option is D $m e s o$ -2,3-dimethyl oxirane
When KOH is added to the optically active halohydrin 3-bromobutan-2-ol, meso-2,3-dimethyl oxirane is obtained.

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

H_{3} P O_{4} - --- \to

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