Notes on GE Chemistry - II (Generic Elective Chemistry - II) Aromatic Hydrocarbons: Compounds having chemistry similar to benzene are traditionally known as aromatic compounds. Benzene shows some unexpected chemical behaviour and a remarkable stability despite the presence of high degree of unsaturation. This special characteristic which imparts stability to the aromatic compounds is called the aromaticity. Aromaticity is a property of typical cyclic planar molecular structures which are generally more stable compared to similar geometric or connective arrangements with the same set of atoms due to pi bonds in resonanance (or delocalisation of electrons). Conditions of aromaticity: The compounds or species are considered to be aromatic if they fulfill the following conditions: 1. The cyclic compounds must have conjugated double bonds. 2. Each ring atom should have an unhybridised p orbital to result in sp2 hybidisation. These unhybridised p orbitals must overlap to