Question

Which of the following statements is true about a peptide bond (RCONHR)?

Options

• It is non planar.

• It is capable of forming a hydrogen bond.

• The cis configuration is favoured over the trans configuration.

• Single bond rotation is permitted between nitrogen and the carbonyl group.

Answer 1

It is capable of forming a hydrogen bond.

Explanation:

The peptide bond can form hydrogen bonds as the –NH group acts as a hydrogen bond donor and the C=O group acts as a hydrogen bond acceptor.

It has partial double bond character due to resonance, making it planar and restricting rotation. Furthermore, the trans configuration is more stable than cis.