question_answer

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

A)  1                                            

B)  2

C)  3                                            

D)  4

Correct Answer: B

Solution :

                where C* = asymmetric C atom It is a symmetrical molecule, so .the number of optically active stereomers \[={{2}^{n}}-1\] (n = number of asymmetric C atom) \[={{2}^{2-1}}\] \[={{2}^{1}}=2\]