2. Monosacchrides contain one carbonyl group and two or more hydroxyl groups(p. 294) 2.1 Monosacchrides can be divided into two families: aldoses and ketoses 2. 1.1 Aldoses have their carbonyl groups at the ends of the carbon chains, thus being an aldehyde 2.1.2 Ketoses have their carbonyl groups at places other than the ends, thus being ketones. dehyde and the simplest ketose is dihyoxyacetone, both being triose.2. Monosacchrides contain one carbonyl group and two or more hydroxyl groups. (p. 294) 2.1 Monosacchrides can be divided into two families: aldoses and ketoses. 2.1.1 Aldoses have their carbonyl groups at the ends of the carbon chains, thus being an aldehyde. 2.1.2 Ketoses have their carbonyl groups at places other than the ends,, thus being ketones. 2.1.3 The simplest aldose is glyceraldehyde, and the simplest ketose is dihyoxyacetone, both being triose