AP EAMCET202017 Sep 2020Evening ShiftChemistryBiomoleculesActual
Fructose reduces Tollen's reagent due to
Options
- Aprimary alcoholic group
- Bsecondary alcoholic group
- Cenolisation of fructose followed by conversation to aldehyde by base
- Dasymmetric carbon atoms
Correct answer
C. enolisation of fructose followed by conversation to aldehyde by base
Step-by-step solution
Tollen's reagent is ( ( AgNO ₃+ NH ₄ OH ) ) and it enables basic medium. Fructose is a keto-hexose, still it can reduce Tollen's reagent. Because in basic medium, it undergoes epimerisation (Lobry de-Bruyn Van Ekenstein rerrangement) to give an aldehyde (D-glucose/D-mannose). Throughout the equilibrium, keto-enol tautomeism takes place.