Of the following conformations of cyclohexane, the most stable is the

Aboat
Bhalf-chair
Cchair
Dplanar hexagon

Answer: C

The chair has nearly tetrahedral angles (about

11 1^{\circ}

) and all C-H bonds staggered, so it has essentially no angle or torsional strain. The boat suffers from eclipsing and flagpole repulsion, and the half-chair and planar forms are even more strained.

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More questions on Conformational analysis of ethane, butane and cyclohexane

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