JEE Main Chemistry question
How many optically active stereoisomers are possible for butane-2,3-diol, CH₃–CH(OH)–CH(OH)–CH₃?
Answer: 2
Solution
The molecule has two stereocentres with the same substituent pattern on each (an internally symmetric diol). This gives three stereoisomers overall: the (2R,3R) and (2S,3S)
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