When monosaccharides contain an aldehyde group, they are known as aldoses. When containing a ketone group, they are known as ketoses. Monosaccharides are also classified depending on the number of carbon atoms the molecule contains. The molecular formula of fructose is C6H12O6. It also contains a ketone group, hence it is placed in the class of ketohexoses. The structure of fructose is given below.
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