Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Ans. (b) and (c) : enantiomers; (a) with (b) and (a) with (c) : diastereomers.

Sol. All three are butane-2,3-diol. (a) has an internal mirror plane between C-2 and C-3 (both OH on the same side): the meso form. (b) and (c) have the OH groups on opposite sides without a plane of symmetry and are related as object and mirror image ((2R,3R) and (2S,3S)) : enantiomers. The meso form versus either chiral form : diastereomers.