Which of the following molecules has two equally stable chair conformations?

Question

Quizplus · Accepted Answer

Both the axial and equatorial positions of the two methyl groups in cis-1,4-dimethylcyclohexane are equally stable. This is because cis-1,4-dimethylcyclohexane has a plane of symmetry perpendicular to the plane of the ring, which means that both of its chair conformations are identical and have the same energy. The other molecules listed do not have this plane of symmetry and therefore do not have two equally stable chair conformations.

Which of the Following Molecules Has Two Equally Stable Chair