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

1.	How many optically stereoisomers are possible for butene-2,3-diol ?
Answer» 1 2 3 4 Solution :Butane-2,3-diol has two ASYMMETRIC CARBON atoms. `underset("Butane-2,3-diol")(CH_(3)-overset(OH)overset(\|)(CH)-overset(OH)overset(\|)(CH)-CH_(3))` Optically active stereoisomers are I and III `{:(""CH_(3) ""CH_(3)""CH_(3)),("\|""\|""\|"),(" "OH-C-H""H-C-OH""H-C-OH), ("\|""\|""\|"),(""H-C-OH""OH-C-H""H-C-OH),("\|""\|""\|"),(""CH_(3)""CH_(3)""CH_(3) ),("(I)(II)(III)"):}` III is MESO form and is not optically active.

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