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Benzene: Structure O, , Benzene, with the molecular formula CsHg, was first isolated by Michael Faraday in 1825., , In 1865, Friedrich August Kekule gave the first insight into the structure of benzene. He proposed, a structure, in which the six carbon atoms were arranged to form a hexagonal ring with each, carbon atom carrying one hydrogen atom., , The proposed structure of Kekule has alternate single and double bonds. The structure of benzene, suggested by Kekule is known as the Kekule structure., , The resonance structures or canonical structures of benzene are obtained by interchanging the, positions of the double bonds, which takes place due to the deloca, the six carbon atoms in the benzene ring., , , , ition of the m bonds between, , Benzene undergoes substitution in preference to addition, due to resonance., , In 1931, Eric Huckel proposed the modern theory of the aromaticity or aromatic character of, compounds., , A cyclic compound must contain a total of (4n+2) a electrons, where n is an integer, which is, equal to 0, 1, 2, 3., , Benzene: Preparation, , Benzene was first isolated and identified by Michael Faraday. In 1845, Hofmann and his team, isolated benzene from coal tar., , Benzene can be prepared in the laboratory by:, , e Cyclic Polymerisation of Ethyne, e Decarboxylation of Aromatic Acids, ¢ Reduction of Phenol