How many stereoisomers does 1,4-dimethylcyclohexane have? (Count cis and trans isomers; ring flips are not counted.)

Answer: B

C1 and C4 are not stereocentres in the four-different-groups sense, because the two ring paths from each are identical. The only isomerism is cis/trans, and both are achiral (mirror plane through C1 and C4). The total is 2.

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