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Biomolecules question

2019 · 12 Apr · Shift 1 · Q21
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Biomolecules question

2019 · 12 Apr · Shift 1 · Q21

JEE MainChemistryBiomoleculesMCQ+4 / −1
Glucose and Galactose are having identical configuration in all the positions except position
  1. A
    C–5
  2. B
    C–3
  3. C
    C–2
  4. D
    C–4
View written solutionFree

Correct answer: D

  1. Identify the relationship between glucose and galactose

    Glucose and galactose are both aldohexoses. They differ in configuration at only one chiral carbon, so they are epimers.

  2. Recall the specific epimeric position

    • D-Glucose and D-Galactose differ only at the 4th carbon atom.
    • Therefore, they are called C-4 epimers.

  3. Check the options

    • A: C−5C-5C−5 — incorrect
    • B: C−3C-3C−3 — incorrect
    • C: C−2C-2C−2 — incorrect
    • D: C−4C-4C−4 — correct

  4. Conclusion

    Glucose and galactose have identical configuration at all chiral centers except at C−4C-4C−4.

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