The two chair conformations of a cis-1,2- disubstituted cyclohexane such as the one you made with models appear on superficial examination to be enantiomers.
a. Draw the two apparent enantiomers using X as the substituent.
b. In fact cis-1,2-diXcyclohexane is a meso com- pound and exists as a single achiral stereoisomer. Explain why it cannot be resolved into two enan- tiomers shown in part a.