Question:
Reducing sugar in urine can be detected by?
Reducing sugar in urine can be detected by?
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Benedict, Fehling and glucose-oxidase can all pick up sugar in urine.
Updated On: Jun 24, 2026
- Benedict's test
- Fehling's solution
- Glucose-oxidase test
- All of the above
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The Correct Option is D
Solution and Explanation
Step 1: A reducing sugar has a free aldehyde or ketone group that can reduce cupric ions. Detection tests rely on this property.
Step 2: Benedict's test uses alkaline copper sulphate; a reducing sugar reduces blue cupric ions to red-orange cuprous oxide, giving a colour change. It detects reducing sugar in urine.
Step 3: Fehling's solution works on the same principle of copper reduction and also detects reducing sugars.
Step 4: The glucose-oxidase test is specific for glucose; glucose oxidase acts on glucose and the reaction is read by a coupled colour indicator. Since glucose is itself a reducing sugar, this test detects it in urine too. As all three methods can detect reducing sugar, the answer is All of the above.
Step 2: Benedict's test uses alkaline copper sulphate; a reducing sugar reduces blue cupric ions to red-orange cuprous oxide, giving a colour change. It detects reducing sugar in urine.
Step 3: Fehling's solution works on the same principle of copper reduction and also detects reducing sugars.
Step 4: The glucose-oxidase test is specific for glucose; glucose oxidase acts on glucose and the reaction is read by a coupled colour indicator. Since glucose is itself a reducing sugar, this test detects it in urine too. As all three methods can detect reducing sugar, the answer is All of the above.
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