What is the difference between sucrose, fructose and sugar?

The word “sugar”is used to represent a group of organic compounds known as carbohydrates i.e. sugar and carbohydrates are same thing.
Sugar or carbohydrates are the compounds formed by combination of H, C and O.
Sugars or carbohydratescan be divided into three major groupsdepending upon whether or not they undergo hydrolysis, and if they do, on the number of products formed.
Monosaccharides:The monosaccharides are polyhydroxy aldehydes or polyhydroxy ketones which cannot be decomposed by hydrolysis to give simpler carbohydrates.

Oligosaccharides: Theseare carbohydrates which yield a definite number (2-9) of monosaccharide molecules on hydrolysis.

Polysaccharides :The polysaccharides are carbohydrates of high molecular weight which yield many monosaccharide molecules on hydrolysis.

Fructose and Glucose are monosaccharides. They both have same molecular formula i.e. C₆H₁₂O₆. But they differ in their structural formula.
Glucose in an aldosis i.e. it contains aldehyde group while fructose is a ketoses i.e. it contains ketonic group in its structure.


Sugar which we use in our food as sweetening agent is Sucrose. Sucrose is a disaccharide which on hydrolysis gives two glucose units.
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