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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm269

Which of the following statements about the tripeptide shown is/are correct?

  1. AIt contains two peptide bonds.
  2. BThree molecules of water are lost when it is formed from its three amino acids.
  3. CIts C-terminal residue is achiral.
  4. DIt has two stereocentres.

Answer: A, C, D

A tripeptide has two peptide bonds, formed with loss of two molecules of water (not three). The residues are Ala, Ser and Gly; the C-terminal residue, glycine, is achiral. Alanine and serine each contribute one stereocentre, so there are two in total (RDKit count: 2). The tripeptide is Ala-Ser-Gly.
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