A dipeptide, "x" on complete hydrolysis gives "y' and "z", "y" on treatment with aq. HNO2 produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule. Based on the infor

Question

A dipeptide, "x" on complete hydrolysis gives "y' and "z", "y" on treatment with aq. HNO2 produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule. Based on the information given, the dipeptide X is :

(A) valine-glycine
(B) alanine-alanine
(C) valine-leucine
(D) alanine-glycine

Prashant Kotian · Accepted Answer

Correct answer: D. NH O H3O+ Dipeptide ‘X’ Y + Z  CH3–CH– COOH | OH NH O HNO2 Lactic acid Y = 3 NH | COOH – CH – CH (Alanine) Z = CH2 NH2 COOH (Glycine)

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