Sucrose
Sucrose is a non-reducing sugar because:
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About This Question
- Subject
- chemistry
- Chapter
- biomolecules
- Topic
- sucrose
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
It has no free aldehyde/ketone group
A sugar is reducing if it possesses a free hemiacetal or hemiketal group (which is in equilibrium with a free aldehyde or ketone in aqueous solution).
- Sucrose is composed of α-D-Glucose and β-D-Fructose.
- The glycosidic linkage occurs between C1 of glucose (the aldehyde carbon) and C2 of fructose (the ketone carbon).
- Since both anomeric carbons are involved in the bond, there is no free carbonyl group available to reduce Tollen's or Fehling's reagents.
This easy difficulty chemistry question is from the chapter biomolecules, covering the topic of sucrose. It appeared in the 2025 exam.
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