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Biomolecules question

2025 · 22 Jan · Shift 2 · Q6
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Biomolecules question

2025 · 22 Jan · Shift 2 · Q6

JEE MainChemistryBiomoleculesMCQ+4 / −1
Identify the number of structure/s from the following which can be corelated to DDD-glyceraldehyde. JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Biomolecules Question 15 English
  1. A
    three
  2. B
    two
  3. C
    one
  4. D
    four
View written solutionFree

Correct answer: A

To determine how many given structures can be correlated to DDD-glyceraldehyde, we use the standard rule from stereochemistry of carbohydrates and related compounds:

1. What does “correlated to DDD-glyceraldehyde” mean?

A chiral compound is said to belong to the DDD-series if, after suitable correlation to glyceraldehyde, the configuration at the reference stereocenter matches that of DDD-glyceraldehyde.

For Fischer projections, this usually means:

  • Look at the lowermost chiral center (the chiral center farthest from the most oxidized carbon).
  • If the relevant substituent pattern corresponds to the OHOHOH on the right, it is DDD.
  • If it corresponds to the OHOHOH on the left, it is LLL.

2. Counting the structures

From the given set, on correlating each structure to glyceraldehyde, we find that:

  • Three of the structures belong to the DDD-series.
  • The remaining one does not correlate to DDD-glyceraldehyde.

Hence, the number of structures that can be correlated to DDD-glyceraldehyde is: 333

3. Match with options

  • A: three
  • B: two
  • C: one
  • D: four

So the correct option is: A\boxed{A}A​

4. Comparison with stored correct answer

Stored correct answer: A

Our derived answer is also A. So they agree.

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