The chemistry of sugar. In the chemistry, sugar has many name and form. Sugar molecules are classified as mono- and disaccharides. Sugar contains carbon, oxygen and hydrogen arranged in a ringed structure. Almost all sugars have the formula CnH2nOn. The most common naturally occurred monosaccharide are fructose, glucose, and galactose . Fructose can be found in fruits and vegetables.Sucrose react dehydration from glucose and fructose. It is found in sugar cane, sugar beet, honey, corn syrup and is more commonly known as table sugar. Lactose react dehydration from glucose and galactose. Maltose react dehydration from glucose and glucose. It can be found in malt. Naturally occurred sugar refers to the sugar that is an integral ingredient of all fruit, vegetable, and milk products whereas added sugar refers to sucrose or other refined sugars in soft drinks and integral into food, fruit drinks, and other beverages.