Word Count : 250

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An unsubstituted cyclohexane has several important conformations whose relative energies produce a characteristic energy profile. The most stable conformation is the chair, which minimizes torsional strain by having all C–H bonds staggered and eliminates angle strain by approximating 109.5°. A chair converts to the equivalent chair through a series of higher-energy states: half-chair (highest), then twist-boat and boat intermediates. The half-chair is ___ _____ _______ _______ ________ _____ ___ __________ _____ ____ _______ _______.
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