Question

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

Answer 1

Monosaccharides contain a carbonyl group.
Hence, they are classified as aldose or ketose.
When aldehyde group is present, the monosaccharides are known as aldose.
When ketone group is present, the monosaccharides are known as a ketose. Fructose has molecular formula $C_6{H}_{12}{O}_6$ containing 6 carbon and keto group and is classified as ketohexose.