Answer :

Both Glucose and Fructose are monosaccharides and hexose sugars (contain six carbons atoms). But structurally they are different as follows-

Glucose


1) It is aldohexose. Its functional group is the aldehyde.


2) It forms a pyranose ring structure and forms a six-membered ring.


Fructose


1) It is ketohexose, and its functional group is the ketone.


2) It forms a furanose ring structure and forms a five-membered ring



OR


Lactose is a disaccharide carbohydrate and therefore on hydrolysis it breaks down in constituent monosaccharides β-D-Glucose and β-D-Galactose.



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