How many stereoisomers does pent-3-en-2-ol, $CH X_{3} - CH (OH) - CH = CH - CH X_{3}$ , have? Count enantiomers, diastereomers and any geometrical isomers about C=C; a meso form counts as one stereoisomer.

Answer: A

C2 is a stereocentre (R or S) and the C3=C4 double bond can be E or Z. The two features are independent and the ends of the molecule are different, so there is no symmetry reduction. The number is

2 \times 2 = 4

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How many stereoisomers does pent-3-en-2-ol, CHX3​−CH(OH)−CH=CH−CHX3​, have? Count enantiomers, diastereomers and any geometrical isomers about C=C; a meso form counts as one stereoisomer.

Answer: A

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How many stereoisomers does pent-3-en-2-ol, $CH X_{3} - CH (OH) - CH = CH - CH X_{3}$ , have? Count enantiomers, diastereomers and any geometrical isomers about C=C; a meso form counts as one stereoisomer.