For each pair of compounds below, determine whether the pair are enantiomers or diastereomers.
(a)
(b)
(c)
(d)
(e)
(f)

Question

For each pair of compounds below, determine whether the pair are enantiomers or diastereomers. (a) (b) (c) (d) (e) (f)

TestHub · Accepted Answer

(a) (2S,3S) vs (2R,3R)-2,3-dibromobutane : every stereocentre is inverted : Enantiomers.

(b) (2S,3S) vs meso-(2S,3R) : only one centre inverted : Diastereomers.

(c) cis-1,2-dimethylcyclopropane (meso) vs trans-1,2-dimethylcyclopropane : cis-trans stereoisomers, not mirror images : Diastereomers.

(d) (2S,3S) vs (2R,3R)-3-bromobutan-2-ol : every centre inverted : Enantiomers.

(e) (E)-but-2-ene vs (Z)-but-2-ene : geometrical isomers : Diastereomers.

(f) (2S,3S) vs meso-(2R,3S)-2,3-dibromobutane : one centre inverted : Diastereomers.

Ans. Enantiomers : (a), (d). Diastereomers : (b), (c), (e), (f).

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