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$\mathrm{C}-\mathrm{N}$bond length in proteins is longer than usual bond length of$\mathrm{C}-\mathrm{N}$bond

Spectroscopic analysis shows planar structure of$-\underset{\mathrm{O}}{\underset{\left|\right|}{\mathrm{C}}}-\mathrm{N}\mathrm{H}-$bond

$\mathrm{C}-\mathrm{N}$bond length in proteins is smaller than usual bond length of$\mathrm{C}-\mathrm{N}$bond

None of these