How many stereoisomers does pentane-2,3-diol, CH3-CH(OH)-CH(OH)-CH2-CH3, have in total?

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NEET levelSingle correct optionDifficulty 1 of 3st058

How many stereoisomers does pentane-2,3-diol, $CH X_{3} - CH (OH) - CH (OH) - CH X_{2} - CH X_{3}$ , have in total?

Answer: C

C2 and C3 are both stereocentres. The two ends of the chain are different (methyl and ethyl), so there is no internal symmetry and no meso form. The number is

2^{2} = 4

(two enantiomeric pairs).

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Answer: C

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How many stereoisomers does pentane-2,3-diol, $CH X_{3} - CH (OH) - CH (OH) - CH X_{2} - CH X_{3}$ , have in total?