What is the stereochemical relationship between cis-1,2-dimethylcyclohexane and trans-1,2-dimethylcyclohexane?

AEnantiomers
BConformers
CDiastereomers
DIdentical compounds

Answer: C

They have the same constitution and differ in configuration at some, but not all, stereocentres, and they are not mirror images (the cis form is achiral). They are therefore diastereomers (geometrical isomers). Chair flips interconvert conformers only within one configuration.

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