Benedict's Test
Easychemistry
Benedict's test is positive for:
Select the correct option:
Solution
Incorrect! Answer:
Glucose
Benedict's Test is used to detect Reducing Sugars.
- Reducing sugars have a free (or potentially free) aldehyde or ketone group that can reduce Cu2+ (blue complex) to Cu2O (brick-red precipitate).
- Glucose, being an aldose, is a strong reducing sugar and gives a positive result.
- Sucrose is non-reducing because its functional groups are tied up in the glycosidic bond.
- Polysaccharides like Starch and Cellulose do not give a significant positive result because they lack a sufficient number of free hemiacetals.
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About This Question
- Subject
- chemistry
- Chapter
- biomolecules
- Topic
- benedict's test
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Glucose
Benedict's Test is used to detect Reducing Sugars.
- Reducing sugars have a free (or potentially free) aldehyde or ketone group that can reduce Cu2+ (blue complex) to Cu2O (brick-red precipitate).
- Glucose, being an aldose, is a strong reducing sugar and gives a positive result.
- Sucrose is non-reducing because its functional groups are tied up in the glycosidic bond.
- Polysaccharides like Starch and Cellulose do not give a significant positive result because they lack a sufficient number of free hemiacetals.
This easy difficulty chemistry question is from the chapter biomolecules, covering the topic of benedict's test. It appeared in the 2025 exam.
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