Question

Which of the following statements is true about a peptide bond

 (\( \text{RCONHR'} \))?

• A. \( \text{It is non-planar.} \)
• B. \( \text{It is capable of forming a hydrogen bond.} \)
• C. \( \text{The cis configuration is favoured over the trans configuration.} \)
• D. \( \text{Single bond rotation is permitted between nitrogen and the carbonyl group.} \)

Hint:

Peptide bonds are rigid and planar, and their ability to form hydrogen bonds is crucial for stabilizing protein structures.

Answer 1

The Correct Option is B

A peptide bond forms between the carboxyl group of one amino acid and the amino group of another. This bond has the following characteristics:\[\text{Peptide Bond: RCONHR'}\]Explanation of the properties of peptide bonds:
1. The peptide bond is planar due to resonance between the carbonyl and nitrogen atoms, resulting in partial double-bond character.
2. The \( \text{NH} \) group of the peptide bond acts as a hydrogen bond donor, while the \( \text{C=O} \) group acts as a hydrogen bond acceptor, facilitating hydrogen bond formation.
3. The trans configuration is favored over cis to reduce steric hindrance between adjacent amino acid side chains.
4. Rotation around the nitrogen-carbonyl bond is limited due to its partial double-bond character.
Final Answer:\[\boxed{\text{It is capable of forming a hydrogen bond.}}\]