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Chemistry Question on Aldehydes, Ketones and Carboxylic Acids

The correct structure of dipeptide, Gly-Ala (glycyl alanine) is:

A

H2NCH2CONHCH(CH3)COOH\text{H}_2\text{NCH}_2\text{CONHCH(CH}_3\text{)COOH}

B

HOOC−CH2−NH−CO−CH(CH3)−NH2\text{HOOC} - \text{CH}_2 - \text{NH} - \text{CO} - \text{CH(CH}_3\text{)} - \text{NH}_2

C

HOOC−CH(CH3)−NH−CO−CH2−NH2\text{HOOC} - \text{CH(CH}_3\text{)} - \text{NH} - \text{CO} - \text{CH}_2 - \text{NH}_2

D

H2N−CH(CH3)−CO−NH−CH2−COOH\text{H}_2\text{N} - \text{CH(CH}_3\text{)} - \text{CO} - \text{NH} - \text{CH}_2 - \text{COOH}

Answer

H2NCH2CONHCH(CH3)COOH\text{H}_2\text{NCH}_2\text{CONHCH(CH}_3\text{)COOH}

Explanation

Solution

The dipeptide Gly-Ala is formed by joining the amino group of glycine with the carboxyl group of alanine, leading to the structure H2NCH2CONHCH(CH3)COOH\text{H}_2\text{NCH}_2\text{CONHCH(CH}_3\text{)COOH}.The correct dipeptide structure involves the amino group (NH2) of glycine forming a peptide bond with the carboxyl group (COOH) of alanine. Thus, the correct structure is:CH₂ - CO - NH - CH(CH₃) - COOH.