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(B) Butane-$2,3$-diol has two chiral centers at $C-2$ and $C-3$. The structure is $CH_3-CH(OH)-CH(OH)-CH_3$. It exists in three stereoisomeric forms:

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$2$

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(B) Butane-$2,3$-diol has two chiral centers at $C-2$ and $C-3$. The structure is $CH_3-CH(OH)-CH(OH)-CH_3$. It exists in three stereoisomeric forms: $1$. $(2R, 3R)$-butane-$2,3$-diol (optically active) $2$. $(2S, 3S)$-butane-$2,3$-diol (optically active) $3$. $(2R, 3S)$-butane-$2,3$-diol (meso form,optically inactive due to internal compensation). Thus,there are $2$ optically active stereoisomers.

How many optically active stereoisomers are there for butane-$2,3$-diol?

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