How many stereoisomers does 1,3-dimethylcyclopentane have? Treat the ring as planar for the purpose of counting.

Answer: D

There are two stereocentres, C1 and C3, which are equivalent by symmetry. The cis isomer has a mirror plane and is meso. The trans isomer is chiral and exists as an enantiomeric pair, so the total is 3.

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