Question

Structures of 3 Monosaccharides are given below. Two of them are Anomers. Identify the two Anomers.

• A. `II is the anomer of both I and II.
• B. I and II are Anomers.
• C. II and III are Anomers.
• D. I and III are Anomers.

Hint:

To identify anomers, look for the difference in the configuration of the anomeric carbon, which is the carbon derived from the aldehyde or ketone group in the open-chain form.

Answer 1

The Correct Option is D

Anomers are a type of stereoisomers that differ in configuration only at the anomeric carbon. The anomeric carbon is the carbonyl carbon in the open-chain form that becomes a stereocenter when the monosaccharide cyclizes to form a cyclic structure. Looking at the structures: - Structure I and Structure III are anomers because they differ in the configuration at the anomeric carbon (the carbon that was originally part of the carbonyl group in the open-chain form). - Structure II is not an anomer of I or III, as it has a different configuration at a different carbon and is not derived from a similar open-chain form. Therefore, Structures I and III are the two anomers. Thus, the correct answer is (D)