Peptide Bond

Question

Peptide bond between amino acids is:

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1. **Formation**: A peptide bond results from the condensation reaction between the $\alpha$-carboxyl group of one amino acid and the $\alpha$-amino group of another, releasing water.
2. **Resonance**: In the $-CO-NH-$ linkage, the lone pair on Nitrogen is delocalized into the Carbonyl group. 
3. **Effect**: This creates **partial double bond character** in the $C-N$ bond.
4. **Geometry**: Due to this character, the rotation around the $C-N$ bond is restricted, making the peptide linkage **rigid and planar**.
5. **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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Peptide Bond

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