Carbohydrates are polyhydroxy aldehyde or polyhydroxy ketones of compounds thereof or polymers that can liberate those compounds upon hydrolysis. With some exceptions, carbohydrates have general formula CnH2nOn where n refers to any positive integer. Carbohydrates can be represented by (CH2O)n where n ≥ 3. Carbohydrates are major source of energy for man and many animals. In man’s diet, the chief carbohydrate is starch. For child, lactose is major source of carbohydrate.