It was Kekule (1865) who first recognized that all aromatic compounds contained at least six carbon atoms. He proved that the simplest aromatic compound having six carbon atoms is Benzene. The structure of Benzene was proved by Kekule as a cyclic planer six carbon unit structure with alternate single and double bonds--each carbon atom is attached to one another atom by covalent bond. Since all the aromatic compounds are derived from benzene, they are also called as Benzenoids or Benzenoid compounds.
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