ChemistryOrganic Chemistry

Which of the Following Cycloalkanes Has the Least Ring Strain?

Which of the following cycloalkanes has the least ring strain? Cyclohexane wins this four-option comparison because its chair minimizes strain.

Question

Which of the following cycloalkanes has the least ring strain?(A) cyclopropane(B) cyclopentane(C) cyclohexane(D) cycloheptane

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Evidence boundary

This answer applies to the four named, unsubstituted rings in Georgia Tech Quiz 3-1, question 4, compared in their preferred conformations. It does not mean every cyclohexane conformation is unstrained: boat and twist-boat forms have higher energy. No numerical strain energies are inferred from a flat ring drawing.