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What are reducing sugars ?...

What are reducing sugars ?

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Carbohydrates which reduces Fehling's solution to red precipitate of `Cu_(2)O` or Tollen's reagent to metallic Ag are called reducing sugars. All monosaccharides (both aldoses and ketoses) and disaccharides excepts sucrose are reducing sugars. Thus, `D - (+) -` glucose, `D-(-)-` fructose, `D - (+) -` maltose and `D - (+) -` lactose are reducing sugars.
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Knowledge Check

  • Which of the following are the reducing sugars?

    A
    X and Y
    B
    X and Z
    C
    Y and Z
    D
    All of these

  • In disaccharides, if the reducing groups of monosaccharides, i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?

    A
    B
    C
    D

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    Reducing sugars are

    Which of the following carbohydrate is a reducing sugar ?

    Which of the following are non-reducing sugars -

    In disaccharides, if the reducing groups of monosaccharides, i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?

    Which of the following is/are non-reducing sugars?

    Name the products of hydrolysis of sucrose. Why sucrose is not a reducing sugar ?

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