Peptide Bond
Mediumchemistry
Peptide bond between amino acids is:
Select the correct option:
Solution
Incorrect! Answer:
Amide bond with partial double bond character (planar)
- Formation: A peptide bond results from the condensation reaction between the α-carboxyl group of one amino acid and the α-amino group of another, releasing water.
- Resonance: In the −CO−NH− linkage, the lone pair on Nitrogen is delocalized into the Carbonyl group.
- Effect: This creates partial double bond character in the C−N bond.
- Geometry: Due to this character, the rotation around the C−N bond is restricted, making the peptide linkage rigid and planar.
- Length: The C−N bond length in a peptide is shorter than a standard single bond (1.32 Å vs 1.47 Å).
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About This Question
- Subject
- chemistry
- Chapter
- biomolecules
- Topic
- peptide bond
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Amide bond with partial double bond character (planar)
- Formation: A peptide bond results from the condensation reaction between the α-carboxyl group of one amino acid and the α-amino group of another, releasing water.
- Resonance: In the −CO−NH− linkage, the lone pair on Nitrogen is delocalized into the Carbonyl group.
- Effect: This creates partial double bond character in the C−N bond.
- Geometry: Due to this character, the rotation around the C−N bond is restricted, making the peptide linkage rigid and planar.
- Length: The C−N bond length in a peptide is shorter than a standard single bond (1.32 Å vs 1.47 Å).
This medium difficulty chemistry question is from the chapter biomolecules, covering the topic of peptide bond. It appeared in the 2025 exam.
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