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MCQMediumJEE Main 2025 · 4 April, Shift 2Proteins (Amino Acids, Structure, Denaturation)

Chemistry Question from JEE Main 2025 · 4 April, Shift 2

A dipeptide, “x”, on complete hydrolysis gives “y” and “z”; “y” on treatment with aqueous HNO2\text{HNO}_2, produces lactic acid. On the other hand, “z” on heating gives the following cyclic molecule.

Six-membered cyclic diketopiperazine-like ring with two carbonyl groups opposite each other and two NH groups, containing two CH2 units in the ring.

Based on the information given, the dipeptide X is:

  • A

    valine-glycine

  • B

    alanine-glycine

  • C

    valine-leucine

  • D

    alanine-alanine

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