Which of the following statements is true?

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(A) is correct. In $cis-1,2-dimethylcyclopropane$,the two methyl groups are on the same side of the ring,leading to significant van der Waals' repulsi

Vedclass · Accepted Answer

van der Waals' strain in $cis-1,2-dimethylcyclopropane$ is the principal reason for its decreased stability relative to the $trans$ isomer.

Vedclass · Answer

(A) is correct. In $cis-1,2-dimethylcyclopropane$,the two methyl groups are on the same side of the ring,leading to significant van der Waals' repulsion (steric strain) between them,which makes the $cis$ isomer less stable than the $trans$ isomer.$B$ is incorrect because cyclohexane has the lowest heat of combustion per $CH_2$ group due to its lack of angle strain.$C$ is incorrect because the principal source of strain in the boat conformation of cyclohexane is torsional strain (eclipsing interactions) and flagpole interactions,not angle strain.$D$ is incorrect because the principal source of strain in the gauche conformation of butane is van der Waals' repulsion (steric strain) between the methyl groups,not torsional strain.

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