Organic chemistry is the study of the structure, properties, reactions, composition and preparation of compounds consisting of Carbon (and Hydrogen). These compounds may contain other elements, including oxygen, nitrogen, the halogens and sulphur. Most of all the compounds discovered in the world today are organic, and there are so many due to the number of bonds Carbon can form - 4. This means that very long chains of carbon compounds can form (e.g. octane).

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