KCET2012ChemistryBiomolecules
Sucrose is not a reducing sugar since
Options
- Ait contains no free aldehyde or keto group adjacent to, > CHOH group
- Bit is built up of a fructose unit
- Cit is optically active
- Dit is chemically stable
Correct answer
A. it contains no free aldehyde or keto group adjacent to, > CHOH group
Step-by-step solution
Carbohydrates which can reduce Tollen's reagent or Fehling solution are called reducing sugars. All the monosaccharides and the disaccharides (except sucrose) are reducing agent. Sucrose does not have free aldehyde or keto group adjacent to > CHOH group, therefore it fails towards Tollen's reagent and Fehling solution.