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An arene is a hydrocarbon containing a benzene ring as a structural unit. The simplest arene is benzene (C6H6). The term "aromatic" originally referred to compounds derived from fragrant substances but now signifies a special stability. Arenes are generally insoluble in water and are liquids or solids at room temperature. Historically, coal tar was a primary source, but petroleum is now the main source for aromatic hydrocarbons. Arenes are used in the synthesis of plastics, fibers, dyes, and drugs.1234

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