Carbohydrates are the single most abundant class of organic molecules found in nature.The name carbohydrate arises from the basic molecular formula (CH2O)which can be rewritten (C.H2O) to show that these substances are hydrates of carbon,where n-3 or more. Carbohydrates are the single most abundant class of organic molecules found in nature. The name carbohydrate arises from the basic molecular formula (CH2O)n, which can be rewritten (C·H2O)n to show that these substances are hydrates of carbon, where n=3 or more