cis-1,2-Dichlorocyclohexane and trans-1,2-dichlorocyclohexane are related as:

Aidentical compounds
Bconformational isomers only
Cenantiomers
Ddiastereomers

Answer: D

Both have the same connectivity but a different relative arrangement of the Cl atoms on the ring, and they are not mirror images because the cis form is meso. Stereoisomers that are not mirror images are diastereomers. Geometrical isomers of rings are a special case of diastereomers.

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