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The carbohydrates which yield two molecules of the same or different monosaccharides on hydrolysis are called as disaccharides.

Examples:

Maltose
(Disaccharide)

―→

Glucose
(Monosaccharide)

+

Glucose
(Monosaccharide)

Lactose
(Disaccharide)

―→

Glucose
(Monosaccharide)

+

Galactose
(Monosaccharide)

They contain 12 carbon atoms in their molecules. Lactose, maltose and sucrose. (C12H22O11)

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