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

Question

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

TestHub · Accepted Answer

Both Newman projections look along the C₂-C₃ bond of butan-2-ol (front carbon = the stereocentre bearing OH, CH₃, H).

(a) The two front substituents CH₃ and H are interchanged while the back carbon is unchanged: the configuration of the stereocentre is inverted : enantiomers.

(b) The second projection is the first rotated bodily by 120 deg (front and back spokes rotated together): same configuration : identical.

Ans. (C) (a) Enantiomers (b) Identical.

Chemistry - STEREO ISOMERISM Question with Solution | TestHub

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