Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETChemistryBiomolecules

Why is lactose considered a reducing sugar?

Options

  1. AIt contains an aldehyde group at C-1 of galactose.
  2. BIt contains an aldehyde group at C-4 of glucose.
  3. CIt contains a ketone group at C-2 of galactose.
  4. DIt contains a ketone group at C-3 of glucose.

Correct answer

A. It contains an aldehyde group at C-1 of galactose.

Step-by-step solution

Lactose may produce a free aldehyde group at C-1 of the glucose unit, making it a reducing sugar.

Practice Biomolecules on Quantrex Academy →

More from Biomolecules

What type of sugar is the stachyose? 2026What is the number of stereo structure of glucose? 2026Which of the following is having largest size? 2026Which of the following is non reducing sugar? 2026Which of the following exists as a zwitter ion ? 2026Which of the following is a disaccharide ? 2026Name the polymer in which chains are formed by -1,4-glycosidic linkages between -glucose units and branches are formed by -1,6-glycosidic linkages. 2026Match List I with List II List I (CARBOHYDRATE) List II (TYPE) (A). Glycogen (I). Oligosaccharide (B). Stachyose (II). Monosaccharide (C). Ribose (III). Polysaccharide Choose the c 2026 Full Biomolecules list All NEET PYQs