Which of the following bonds allow(s) for free rotation?
I. A carbon-carbon single bond in an alkane
II. A carbon-carbon double bond in an alkene
III. A carbon-carbon single bond in a cyclic alkane

Question

Quizplus · Accepted Answer

A carbon-carbon single bond in an alkane allows for free rotation because the two bonded atoms can rotate around the single bond axis without breaking the bond. The carbon-carbon double bond in an alkene does not allow for free rotation because of the presence of the pi bond that restricts the rotation. A carbon-carbon single bond in a cyclic alkane can also restrict rotation due to the cyclic nature of the molecule.

Which of the Following Bonds Allow(s) for Free Rotation