\( x \) is a peptide which is hydrolyzed to 2 amino acids \( y \) and \( z \). \( y \) when reacted with HNO\(_2\) gives lactic acid. \( z \) when heated gives a cyclic structure as below:
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Lactic acid formation upon reaction with HNO\(_2\) typically suggests the presence of Glycine, while the ability to form a cyclic structure upon heating points to Alanine.
Given peptide \( x \) hydrolyzes into two amino acids \( y \) and \( z \).
1. \( y \) reacts with HNO\(_2\) to yield lactic acid. This implies \( y \) has a primary amine group, and the reaction with nitrous acid commonly produces a carboxylic acid. Glycine is the most likely candidate for \( y \) due to its simple structure and reaction with HNO\(_2\) to form lactic acid.
2. \( z \) forms a cyclic structure when heated. This suggests \( z \) is an amino acid capable of cyclization. Alanine is the most probable candidate as it can form a cyclic structure, similar to proline, upon heating.
Therefore, \( y \) is Glycine, and \( z \) is Alanine. The correct answer is (2) Alanine and Glycine.
