JEE Chemistry 2025 Question with Solution

Given: Four structures are to be checked for correlation with D-glyceraldehyde.

Find: The number of structures that can be correlated to D-glyceraldehyde.

The solution states that D-glyceraldehyde is identified by the Fischer projection in which the hydroxyl group at the relevant chiral center is on the right side. It then compares the given structures one by one.

From the extracted comparison:

1. Structure A does not match D-glyceraldehyde.
2. Structure B matches D-glyceraldehyde.
3. Structure C matches D-glyceraldehyde.
4. Structure D does not match D-glyceraldehyde.

Therefore, the number of structures correlated to D-glyceraldehyde is $2$.

The correct option is C.

Note: The prose inside the solution mentions three, but that contradicts both the listed matching structures (B and C only) and the solution stating the correct option is C. Hence the defensible conclusion from the provided solution content is two.

Given: Correlation is to be made with D-glyceraldehyde using the Fischer projection idea.

Find: How many of the shown structures have the same relevant stereochemical correlation.

The hint says to check the configuration at the chiral center. The extracted solution further states:

• D-glyceraldehyde has a chiral center.
• In its Fischer projection, the hydroxyl group is on the right.

Now apply this criterion to the listed structures as described in the solution:

• A: does not match.
• B: hydroxyl group on the second carbon is on the right, so it matches.
• C: hydroxyl group on the second carbon is on the right, so it matches.
• D: does not match.

Hence, exactly two structures correlate to D-glyceraldehyde.

Therefore, the correct answer is $2$, that is, option C.