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Tests for Carbohydrates

In the sugars...

Question

In the sugars fructose , lactose and sucrose which carbon should be free to be a reducing sugar?

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Which one of the following pairs of nutrients includes both as simple sugars (monosaccharides) ?

(a) Sucrose and glucose

(b) Glucose and maltose

(c) Fructose and glucose

(d) Maltose and lactose

Q. Identify the incorrect statements among the following.

(a) The relative sweetness of fructose is the maximum and it is a reducing sugar.
(b) The source of lactose is milk and it is reducing sugar
(c) Maltose possesses glycoside bond between one glucose unit and one fructose unit and it is reducing sugar
(d) Glucose possesses aldehyde group and it is a non-reducing sugar
(e) The molecular formula of sucrose is

C_{12} H_{22} O_{11}

and possess glycoside bond between two glucose units.

Q. Assertion :Sucrose is a reducing sugar and exhibits mutarotation. Reason: Sucrose is a disaccharide consisting of glucose and fructose units.

Q. Assertion :Sucrose is a non reducing sugar. Reason: Sucrose is a disaccharide formed by glycosidic linkage between

C - 1

α -

C - 2

β -

Q. Assertion :Fructose is a reducing sugar. Reason: Fructose has a ketonic group.

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Tests for Carbohydrates

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