Monosaccharides contain carbonyl group hence are classified, as aldose or ketose. The number of carbon atoms present in the monosaccharide molecule are also considered for classification. In which class of monosaccharide will you place fructose?

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Solution

Monosaccharides contain carbonyl group hence are classified as aldose or ketose. If the carbonyl group is an aldehyde attached to $C 1$ , the monosaccharide is an Aldose. If the carbonyl group is a ketone attached to $C 2$ , the monosaccharide is a Ketose.

Fructose has $6$ carbons in the straight chain. Its molecular formula is $C_{6} H_{12} O_{6}$ . Fructose contains a ketone group. Hence, it is placed in the class of Ketohexoses. The structure of fructose is given below.

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