Which statement is incorrect about peptide bond?

1. $\mathrm{C}-\mathrm{N}$ bond length in proteins is longer than usual $\mathrm{C}-\mathrm{N}$ bond length
2. Spectroscopic analysis shows planar structure of
   
   
   bond
3. C-N bond length in proteins is smaller than usual $\mathrm{C}-\mathrm{N}$ bond length
4. None of these

Solution

Due to resonance,

$\mathrm{C}-\mathrm{N}$ bond acquires some double bond character, hence shorter in length /

Asked in: JEE-TOPICTESTS-CHEMISTRY

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