Question:
Which of the following is an example of non-reducing sugar?
Which of the following is an example of non-reducing sugar?
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Sucrose is the most common non-reducing sugar. If a carbohydrate question asks for a non-reducing disaccharide, sucrose is almost always the correct answer.
Updated On: Jul 8, 2026
- Glucose
- Fructose
- Sucrose
- Lactose
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Sugars are classified as reducing or non-reducing based on their ability to act as reducing agents.
This property depends on the presence of a free, unlinked active carbonyl group (aldehyde or ketone) that can reduce copper or silver ions in chemical tests like Benedict's or Fehling's.
Step 2: Detailed Explanation:
- Reducing Sugars: All monosaccharides (such as glucose and fructose) are reducing sugars. Many disaccharides, like lactose and maltose, are also reducing because they retain a free hemiacetal group on one of their sugar rings.
- Non-reducing Sugars: Sucrose is a disaccharide composed of glucose and fructose. In sucrose, the glycosidic bond is formed between the anomeric carbon C1 of glucose and the anomeric carbon C2 of fructose. Since both anomeric carbons are locked in the glycosidic linkage, there is no free aldehyde or ketone group available to open up and reduce reagents.
Thus, sucrose is a non-reducing sugar.
Step 3: Final Answer
Sucrose is a non-reducing sugar.
Sugars are classified as reducing or non-reducing based on their ability to act as reducing agents.
This property depends on the presence of a free, unlinked active carbonyl group (aldehyde or ketone) that can reduce copper or silver ions in chemical tests like Benedict's or Fehling's.
Step 2: Detailed Explanation:
- Reducing Sugars: All monosaccharides (such as glucose and fructose) are reducing sugars. Many disaccharides, like lactose and maltose, are also reducing because they retain a free hemiacetal group on one of their sugar rings.
- Non-reducing Sugars: Sucrose is a disaccharide composed of glucose and fructose. In sucrose, the glycosidic bond is formed between the anomeric carbon C1 of glucose and the anomeric carbon C2 of fructose. Since both anomeric carbons are locked in the glycosidic linkage, there is no free aldehyde or ketone group available to open up and reduce reagents.
Thus, sucrose is a non-reducing sugar.
Step 3: Final Answer
Sucrose is a non-reducing sugar.
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