Question:
Identify non reducing sugar from following.
Identify non reducing sugar from following.
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Chemistry Tip: Remember: Sucrose is a common example of non-reducing sugar.
Updated On: Apr 23, 2026
- Sucrose
- Maltose
- Lactose
- Glucose
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The Correct Option is A
Solution and Explanation
Step 1: Meaning of reducing sugar.
Reducing sugars are those carbohydrates which contain a free aldehyde group or free ketone group (through tautomerism) and can reduce Fehling's solution or Tollens' reagent.
Step 2: Analyze sucrose. Sucrose is made of glucose and fructose units. In sucrose, both anomeric carbon atoms are involved in glycosidic bond formation. Therefore no free reactive group is available.
Step 3: Analyze other options.
• Maltose: Has one free anomeric carbon, so it is reducing.
• Lactose: Also has one free anomeric carbon, so it is reducing.
• Glucose: Monosaccharide with free aldehyde form, hence reducing.
Step 4: Compare all compounds. Only sucrose does not have a free anomeric carbon atom.
Step 5: Conclusion. $$ \therefore \text{Non-reducing sugar is (A) Sucrose.} $$
Step 2: Analyze sucrose. Sucrose is made of glucose and fructose units. In sucrose, both anomeric carbon atoms are involved in glycosidic bond formation. Therefore no free reactive group is available.
Step 3: Analyze other options.
• Maltose: Has one free anomeric carbon, so it is reducing.
• Lactose: Also has one free anomeric carbon, so it is reducing.
• Glucose: Monosaccharide with free aldehyde form, hence reducing.
Step 4: Compare all compounds. Only sucrose does not have a free anomeric carbon atom.
Step 5: Conclusion. $$ \therefore \text{Non-reducing sugar is (A) Sucrose.} $$
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