Question:
Statement I: The structure of Maltose is given below: Maltose is a non-reducing sugar.
Statement II: The structure of Lactose is given below: Lactose is a reducing sugar.
Statement I: The structure of Maltose is given below: Maltose is a non-reducing sugar.
Statement II: The structure of Lactose is given below: Lactose is a reducing sugar.
Statement II: The structure of Lactose is given below: Lactose is a reducing sugar.
Updated On: Apr 10, 2026
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is true but Statement II is false
- Statement I is false but Statement II is true
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
A sugar is "reducing" if it has a free hemiacetal group (an anomeric carbon not involved in a glycosidic bond). This allows the ring to open into an aldehyde form that can reduce Tollen's or Fehling's reagents.
Step 2: Key Formula or Approach:
1. Maltose: Glucose + Glucose ($\alpha$-1,4 bond). 2. Lactose: Galactose + Glucose ($\beta$-1,4 bond). 3. Sucrose: Glucose + Fructose (1,2 bond).
Step 3: Detailed Explanation:
1. Maltose analysis: In maltose, the C1 of the first glucose is bonded to the C4 of the second glucose. The C1 of the second glucose is free. Therefore, maltose is a reducing sugar. Statement I is false. 2. Lactose analysis: In lactose, the C1 of galactose is bonded to the C4 of glucose. The C1 of the glucose unit is free. Therefore, lactose is a reducing sugar. Statement II is true.
Step 4: Final Answer:
Statement I is false, but Statement II is true.
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