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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm248

The two cyclic sugars shown are both D-pyranoses. Which of the following is/are correct?

  1. AThey are diastereomers.
  2. BThey are anomers.
  3. CThey differ in configuration at exactly two stereocentres (C-1 and C-2).
  4. DBoth contain a six-membered ring.

Answer: A, C, D

Written in the same atom order, the two structures differ in the chirality tags at C-1 and C-2 only, so they differ at two centres and are not mirror images: diastereomers. Anomers differ only at C-1, so they are not anomers (they are not C-2 epimers either). Both rings are pyranoses with six members.
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