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JEE Main levelSingle correct optionDifficulty 2 of 3bm238

The two cyclic sugars shown (both D-pyranoses) differ in configuration at exactly one ring stereocentre other than the anomeric carbon. They are

  1. AC-4 epimers
  2. BC-2 epimers
  3. Canomers
  4. Denantiomers

Answer: A

Comparing the ring stereocentres, only C-4 differs (the OH at C-4 is up in one and down in the other) while C-1 (beta in both), C-2, C-3 and C-5 agree. They are beta-D-glucopyranose and beta-D-galactopyranose, C-4 epimers.
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