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benzene. Before we examine their proposals, we should note that the problem of the struc- ture of benzene and other aromatic hydrocarbons has occupied the PHARMACEUTICAL ORGANIC CHEMISTRY –II. UNIT I. UNIT I Benzene and its derivatives. 10 Hours. A. Analytical, synthetic and other evidences in the derivation Benzene is the simplest aromatic hydrocarbon. Aromatic compounds have unusual stability that goes far beyond what is predicted by simple resonance stabilization Structure of benzene, downloadable AS & A Level Chemistry revision notes. Like other aromatic compounds, benzene has a planar structure due to the sp2aromatic compounds is substitution at a ring carbon: Substitution of halogen onto a benzene ring Note: deactivation refers to the rate of EAS. are termed as aromatic. Benzene is an aromatic compound having molecular formulae C.H. It contains six carbon atoms, 6-hydrogen atoms and three conjugated Aromaticity: cyclic conjugated organic compounds such as benzene, that exhibit special stability due to resonance delocalization of π-electrons. Characteristic reaction of benzene involves substitution in which resonance stabilized ring is preserved.This reaction is called Aromatic Substitution. Compared an aromatic compound because it contains a benzene ring. Note, too, the relationship between each compound type and a similar open-chained molecule. All of the organic substances we have looked at so far have been aliphatic. Benzene belongs to the aromatic class. Benzene's Structure.