How many stereoisomers of 2,3-butanediol, CH3CH(OH)CH(OH)CH3, exist?

1.	How many stereoisomers of 2,3-butanediol, CH₃CH(OH)CH(OH)CH₃, exist?
A.	3
B.	4
C.	1
D.	2
Answer» B. 4

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