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NEET levelSingle correct optionDifficulty 1 of 3bm237

The two open-chain sugars shown differ in configuration at only one stereocentre, C-2. They are

  1. Aanomers
  2. Benantiomers
  3. CC-2 epimers
  4. Didentical compounds

Answer: C

Both are D-aldohexoses and differ only at C-2 (the C-2 labels are R and S while C-3 to C-5 are the same). Sugars differing at a single stereocentre other than the anomeric one are epimers; these are D-glucose and D-mannose, C-2 epimers. Anomers differ at the new centre formed on ring closure.
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