Peptides are formed by the joining of amino acids through amide linkage. Which of the following statement is not true in this respect?

• A

  Amide groups do not contribute in the hydrogen bonding interactions

• B

  $p\pi$ resonance stabilizes the amide linkages

• C

  Amide groups are more resistant to hydrolysis than the similar ester groups

• D

  Stable conformations of peptides are restricted to those having planar amide groups