Are the following pairs identical, enantiomers, diastereomers, or constitutional isomers?
(a) and
(b) and
(c) and
(d) and

Question

Are the following pairs identical, enantiomers, diastereomers, or constitutional isomers? (a) and (b) and (c) and (d) and

TestHub · Accepted Answer

(a) Both are 1,2,3-trimethylcyclohexane: the C₁ and C₂ configurations match while C₃ differs (wedge vs dash) : diastereomers. (b) Both drawings are (2R,3R)-2,3-dibromobutane - the second is written with the chain traversed from the other end : identical. (c) Butanal and butan-2-one: same formula C₄H₈O, different functional groups : constitutional isomers. (d) Both are trans-1,2-dichlorocyclopropane, (1R,2R) : identical.

Ans. (C) (a) Diastereomers (b) Identical (c) Constitutional isomers (d) Identical.

Chemistry - STEREO ISOMERISM Question with Solution | TestHub

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