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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm245

Which of the following is/are correct for the disaccharide shown?

  1. AIt is a non-reducing sugar.
  2. BComplete acid hydrolysis gives only one kind of monosaccharide.
  3. CIt undergoes mutarotation in water.
  4. DIt gives a positive Fehling test.

Answer: A, B

Both anomeric carbons (C-1 of each ring, each alpha) are linked through the same oxygen, an alpha,alpha-1,1 link (trehalose). No free hemiacetal is left, so it is non-reducing, it does not show mutarotation and gives a negative Fehling test. Hydrolysis of the single glycosidic bond gives two molecules of D-glucose, one kind of sugar.
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