A cyclohexane molecule and a benzene molecule are illustrated below. Which of the four statements describing the relationship between benzene and cyclohexane are true? I. Benzene and cyclohexane have different molecular formulas. II. Benzene and cyclohexane are both flat.
III) Benzene and cyclohexane have different C-C bond lengths.
IV) Benzene is more flexible than cyclohexane.

Question

A cyclohexane molecule and a benzene molecule are illustrated below. Which of the four statements describing the relationship between benzene and cyclohexane are true?  I. Benzene and cyclohexane have different molecular formulas. II. Benzene and cyclohexane are both flat.
III) Benzene and cyclohexane have different C-C bond lengths.
IV) Benzene is more flexible than cyclohexane.

Quizplus · Accepted Answer

I. Benzene (C6H6) and cyclohexane (C6H12) have different molecular formulas.
II. Benzene and cyclohexane are not both flat. Cyclohexane is a chair or boat shape, while benzene is planar.
III. Benzene and cyclohexane have different C-C bond lengths, as benzene's bond length is intermediate between a single bond and a double bond, while cyclohexane has regular single bonds of the same length.
IV. Benzene is more rigid than cyclohexane, as the double bonds in the aromatic ring make it more stable and less able to rotate or flex compared to the single bonds in cyclohexane.

A Cyclohexane Molecule and a Benzene Molecule Are Illustrated Below