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Question
Which of the following diasaccharide gives two molecules of glucose on hydrolysis?
Which of the following diasaccharide gives two molecules of glucose on hydrolysis?
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Solution
The correct option is A Maltose
A dissacharide consists of two sugars joined by an O-glycosidic bond. In a dissacharide, two monosaccharides are joined together by acetal or glycoside formation. The hemiacetal OH of one monosaccharide and OH of second monosaccharide dehydrate to establish the bond called glycosidic bond. For example sucrose is a disaccharide of glucose and fructose residues joined by glycosidic bond between C-1 (anomeric carbon ) of glucose residue and C-2 (anomeric carbon) of fructose residue. The anomeric carbons of both monosaccharide units are involved in the glycosidic bond. Lactose, the disaccharide of milk, consists of galactose joined to glucose by 1,4-glycosidic bond. The disaccharide maltose contains two D-glucose residues joined by a glycosidic linkage between C-1 (the anomeric carbon) of one glucose residue and C-4 of other. Thus, on hydrolysis sucrose gives 1 molecule each of glucose and fructose, lactose gives one molecule each of galactose and glucose and maltose gives 2 molecules of glucose . Therefore, the correct option is A
A dissacharide consists of two sugars joined by an O-glycosidic bond. In a dissacharide, two monosaccharides are joined together by acetal or glycoside formation. The hemiacetal OH of one monosaccharide and OH of second monosaccharide dehydrate to establish the bond called glycosidic bond. For example sucrose is a disaccharide of glucose and fructose residues joined by glycosidic bond between C-1 (anomeric carbon ) of glucose residue and C-2 (anomeric carbon) of fructose residue. The anomeric carbons of both monosaccharide units are involved in the glycosidic bond. Lactose, the disaccharide of milk, consists of galactose joined to glucose by 1,4-glycosidic bond. The disaccharide maltose contains two D-glucose residues joined by a glycosidic linkage between C-1 (the anomeric carbon) of one glucose residue and C-4 of other. Thus, on hydrolysis sucrose gives 1 molecule each of glucose and fructose, lactose gives one molecule each of galactose and glucose and maltose gives 2 molecules of glucose . Therefore, the correct option is A
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