Discussion
Which chiral angle in the peptide backbone does not undergo rotation ?
Answer: D
The angle that does not rotate is \(\omega\) (omega).
Omega is the torsion angle about the peptide bond (C-N). Because of resonance, this bond has partial double-bond character, so the peptide group is planar and omega is fixed near 180° (trans), or rarely 0° (cis, mostly before proline).
Phi (about N-Cα) and psi (about Cα-C) are the freely rotating backbone angles plotted in a Ramachandran diagram. Chi angles describe rotation in the side chains, not the backbone.
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