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)