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JEE Main levelSingle correct optionDifficulty 2 of 3bm239

The two open-chain sugars shown are both D-aldohexoses. Which description is correct?

  1. AC-2 epimers
  2. BC-4 epimers
  3. CEnantiomers
  4. DDiastereomers that are not epimers (they differ at two stereocentres)

Answer: D

Writing both structures in the same atom order, the chirality tags differ at C-2 and C-4 only; C-3 and C-5 are identical. Differing at two centres makes them diastereomers but not epimers: D-glucose and D-talose. Enantiomers would differ at all four centres.
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