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

$(a)\;1 \\ (b)\;2 \\ (c)\;3 \\ (d)\;4$

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.
Hence b is the correct answer.