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How many optically active stereoisomers are possible for butane$-2, 3-$diols?

$ (a)\;1 \\ (b)\;2 \\ (c)\;3 \\ (d)\;4 $
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The number of optically active stereoisomers possible for $2,3-diol$ is 2
ie d and l which are optically active .
The meso- compound is optically inactive due to internal compensation.
2 is the correct answer.
Hence b is the correct answer.
answered Feb 25, 2014 by meena.p

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