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JEE Main levelSingle correct optionDifficulty 2 of 3bm242

The disaccharide shown has one glycosidic bond. Which description of it is correct?

  1. ABeta-1,4-glycosidic link; reducing sugar
  2. BAlpha-1,4-glycosidic link; non-reducing sugar
  3. CAlpha-1,6-glycosidic link; reducing sugar
  4. DAlpha-1,4-glycosidic link; reducing sugar

Answer: D

The anomeric carbon (C-1) of the non-reducing ring is alpha and is bonded through oxygen to C-4 of the second ring, an alpha-1,4 link. The second ring still has a free anomeric OH (hemiacetal), so the disaccharide is reducing. It is maltose.
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