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   ocr: HYDROCARBONS YDROCARBONS are the simplest Some hydrocarbons, such as butane H group of organic compounds (camping gas), are made up ofchains they consist of carbon and hydrogen ofcarbon atoms. Others consist of atoms only. Hlydrocarbons are found carbon rings - the best known of in crude oil and natural gas. They are these is benzene. the raw materials from which many other useful substances are made, Lubricating oil including gasoline, plastics, drugs, and paints. Free movement Long-chain lnydrocarbons are thick and waxy and are often used to reduce friction. Lubricating oil, for example, is ...