Define reaction of glucose & fructose with fehlings reagent, Biology

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Define Reaction of glucose and fructose with Fehlings reagent?

Lactose is a milk sugar. It is a reducing disaccharide having a free sugar group and can reduce Fehling's reagent. The alkali of Fehling's reagent converts lactose into the enediol, which reduces the cupric ions to cuprous ions.

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These cuprous ions combine with hydroxyl ions to form cuprous hydroxide, which on further heating forms red cuprous oxide. Methylene blue is used as a redox indicator.


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