Classification of monosaccharides (1)According to the number of carbon atoms present in the molecule triose tetrose pentose hexose 2)According to whether they contain an aldehyde or keto group. aldose ketose ()These two classification are frequently combined for example: C5 aldopentose ketopentose„ Classification of Classification of Monosaccharides Monosaccharides: (1)According to the number of carbon atoms present in the (1)According to the number of carbon atoms present in the molecule. molecule. triose tetrose tetrose pentose pentose hexose (2)According to whether they contain an (2)According to whether they contain an aldehyde aldehyde or keto group. group. aldose ketose (3)These two classification are frequently combined. (3)These two classification are frequently combined. for example : C for example : C5 5 aldopentose aldopentose ketopentose ketopentose