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Question

How is fructose considered as reducing sugar?


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Solution

Fructose is considered as reducing sugar through the following points:

  • A sugar considered as reducing which can be can be oxidized by a weak oxidizing agent such as Tollen's reagent (capable of oxidizing aldehydes, not alcohol) under a basic aqueous solution.
  • Fructose doesn't contain any aldehyde group but it can reduce such reagents.
  • This is due to the reason that the reagents are basic solutions, hence fructose can be isomerized to distinct aldoses( glucose and mannose).


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