Question:
Which one of the following is a non-reducing sugar?
Which one of the following is a non-reducing sugar?
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Sucrose = only common non-reducing sugar.
Updated On: May 2, 2026
- Maltose
- Lactose
- Sucrose
- Glucose
- Fructose
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The Correct Option is C
Solution and Explanation
Concept: Reducing vs Non-reducing sugars
---
Step 1: Definition
Reducing sugars:
• Have free aldehyde or ketone group
• Can reduce Fehling’s or Tollens’ reagent ---
Step 2: Non-reducing sugar
• No free carbonyl group
• Glycosidic bond blocks reactive sites ---
Step 3: Analyze options
• Maltose → reducing ❌
• Lactose → reducing ❌
• Glucose → reducing ❌
• Fructose → reducing ❌
• Sucrose → non-reducing ✅ --- Reason:
In sucrose:
• Both anomeric carbons are involved in bonding
• No free aldehyde/ketone group --- Final Answer: \[ \boxed{\text{Sucrose}} \]
---
Step 1: Definition
Reducing sugars:
• Have free aldehyde or ketone group
• Can reduce Fehling’s or Tollens’ reagent ---
Step 2: Non-reducing sugar
• No free carbonyl group
• Glycosidic bond blocks reactive sites ---
Step 3: Analyze options
• Maltose → reducing ❌
• Lactose → reducing ❌
• Glucose → reducing ❌
• Fructose → reducing ❌
• Sucrose → non-reducing ✅ --- Reason:
In sucrose:
• Both anomeric carbons are involved in bonding
• No free aldehyde/ketone group --- Final Answer: \[ \boxed{\text{Sucrose}} \]
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