(1R,2R)-1,2-Dimethylcyclopropane is a chiral compound. What is the descriptor set of its enantiomer?

A(1R,2S)
B(1S,2R)
C(1R,2R)
D(1S,2S)

Answer: D

An enantiomer has the opposite descriptor at every stereocentre, so (1R,2R) becomes (1S,2S). The sets (1R,2S) and (1S,2R) describe the same achiral cis (meso) isomer, which is a diastereomer of the trans pair.

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