MolSynapsequestion bank
MolSynapse / Question bank / Biomolecules / Anomers, epimers and reducing sugars from drawings
JEE Main levelSingle correct optionDifficulty 2 of 3bm243

Assertion (A): The compound shown shows mutarotation when dissolved in water. Reason (R): It contains a free anomeric hydroxyl group, so the ring can open to the aldehyde and reclose to give either anomer.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

Beta-D-glucopyranose has a hemiacetal carbon (C-1 with ring O and OH), so the ring opens reversibly to the CHO form and recloses to alpha and beta anomers, changing the specific rotation to an equilibrium value. Thus both statements are true and R explains A.
Practice Biomolecules More on Anomers, epimers and reducing sugars from drawings
Previous questionNext question

More questions on Anomers, epimers and reducing sugars from drawings