Arrange the following conformational changes of cyclohexane from least to most stable: A. Chair conformation, B. Twist-boat conformation, C. Boat conformation, D. Half-chair conformation.

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Seekh · Accepted Answer

The least stable conformation is the half‑chair because it forces many bonds to bend and creates a lot of strain. Next comes the boat, which has eclipsing interactions and a “flagpole” strain that makes it less stable. The twist‑boat is better because it reduces eclipsing and flagpole strain, so it sits above the boat in stability. Finally the chair is the most stable, because all bonds are staggered and the ring is fully relaxed. For example, when a cyclohexane ring flips from chair to half‑chair, the energy rises sharply, showing how the half‑chair is the least favorable.

Arrange the following conformational changes of cyclohexane from least to most stable: A. Chair conformation, B. Twist-boat conformation, C. Boat conformation, D. Half-chair conformation.

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