In organic chemistry, a hexose's a monosaccharide with six carbon atoms, having the chemical formula C6H12O6. Hexoses are classified by functional group, with aldohexoses having an aldehyde at position 1, and ketohexoses having a ketone at position 2. Aldohexoses The aldohexoses have four chiral centres for a total of 16 possible aldohexose stereoisomers (24). The D/L configuration's based on the orientation of the hydroxyl at position 5, and doesn't refer to the direction of optical activity. T… (More on Hexose)