The name organic chemistry originated at the beginning of the 19th century, when scientists wishes to differentiate between those substances derived from plant and animal (organic) materials. It was believed that organic substances had special qualities and could be created only in the presence of the “vital force” found in living organisms. Even though the vital force theory was eventually disproved, the classification of chemical substances as organic or inorganic has continued to present. The modern usage of “organic chemistry” refers to the chemistry of compounds containing carbon . These organic substances are generally characterized by chains of connected carbon atoms. Millions of such organic compounds are known. Many of these are “natural products,” or compounds found in nature. The study of the large organic molecules found in living systems and their reactions, which make up the life processes, has come to be called biochemistry. A large number of the known organic chemi