Q13 / 180 · COMEDK 2026 (9 May Shift 2) · Chemistry
Identify the correct statement.
- AExcept Glycine and Tryptophan all the other naturally occurring Amino acids are optically active
- Correct answerBGlucose gets oxidised to Gluconic acid with Br$_2$(aq) which indicates that the carbonyl group in it is an Aldehydic group
- CThe "D" in D(+) –glucose represents the dextrorotatory nature of Glucose and (+) stands for its configuration
- DDuring denaturation of Proteins its 3- dimensional structure is destroyed because the primary, secondary and tertiary structures get destroyed due to rise in temperature
Solution
Glycine is the only naturally occurring amino acid that is optically inactive because its $\alpha$-carbon is attached to two hydrogen atoms. Tryptophan is optically active. Thus, the first statement is incorrect.
Bromine water is a mild oxidising agent that specifically oxidises aldehydes to carboxylic acids. The oxidation of glucose to gluconic acid by bromine water confirms the presence of an aldehydic group. Thus, the second statement is correct.
In D(+)-glucose, 'D' represents the relative configuration with respect to glyceraldehyde, while '(+)' represents the dextrorotatory nature of the molecule. Thus, the third statement is incorrect.
During the denaturation of proteins, the secondary and tertiary structures are destroyed due to the unfolding of the protein chain, but the primary structure (the sequence of amino acids) remains intact. Thus, the fourth statement is incorrect.
Answer: Glucose gets oxidised to Gluconic acid with Br$_2$(aq) which indicates that the carbonyl group in it is an Aldehydic group
Bromine water is a mild oxidising agent that specifically oxidises aldehydes to carboxylic acids. The oxidation of glucose to gluconic acid by bromine water confirms the presence of an aldehydic group. Thus, the second statement is correct.
In D(+)-glucose, 'D' represents the relative configuration with respect to glyceraldehyde, while '(+)' represents the dextrorotatory nature of the molecule. Thus, the third statement is incorrect.
During the denaturation of proteins, the secondary and tertiary structures are destroyed due to the unfolding of the protein chain, but the primary structure (the sequence of amino acids) remains intact. Thus, the fourth statement is incorrect.
Answer: Glucose gets oxidised to Gluconic acid with Br$_2$(aq) which indicates that the carbonyl group in it is an Aldehydic group
Hence, the correct answer is option: 'B'.