How many optically active stereoisomers are possible for butan-2, 3-diol?

1

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2

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3

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4

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Solution

The correct option is B $2$
The number of optically active stereoisomers possible for 2,3−diol is 2. They are $d, l$ isomers which are optically active. The meso- compound is optically inactive due to internal compensation. Hence, option B is correct.

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