NEET 2016 Phase 1 · ChemistryCarbohydratesPrevious Year Question
Which one given below is a non-reducing sugar?
Answer: (D) Sucrose. \textbf{Answer:} (D) Sucrose has no free anomeric carbon, so it is non-reducing.
- A.Maltose
- B.Lactose
- C.Glucose
- D.Sucrose✓
Correct Answer
(D) Sucrose
Solution & Explanation
\textbf{Answer:} (D) Sucrose has no free anomeric carbon, so it is non-reducing. \textbf{Solution:} In sucrose () the glycosidic linkage joins the anomeric carbon of glucose (C-1) to the anomeric carbon of fructose (C-2), so no free hemiacetal/hemiketal ( on anomeric C) group remains — hence it is non-reducing. Maltose and lactose each retain one free anomeric carbon, and glucose has a free ; all three are reducing sugars.
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