Problem: For cis-1,3-dimethylcyclohexane, which two chair conformations are in equilibrium?

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In chair conformations, steric interaction occurs to the axial groups at C1 and C3 positions which is called 1,3-diaxial interaction

Recall that for cis or trans is based on whether the groups are facing the same face (top or bottom) of the ring.

Inspecting each chair:

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For cis-1,3-dimethylcyclohexane, which two chair conformations are in equilibrium?