Aromatic example sentences

Since most of them possess pleasant odour (Greek; aroma meaning pleasant smelling), the class of compounds was named as 'aromatic compounds'.Aromaticity, the property of being aromatic is possessed by compounds having specific electronic structure characterised by Hückel (4n+2)? electron rule.The nomenclature and isomerism of aromatic hydrocarbons has already been discussed in Unit 1 All six hydrogen atoms in benzene are equivalent; so it forms one and only one type of monosubstituted product.The remaining electron at each carbon is delocalised in molecular orbitals, which in turn give aromatic character to molecule.Aromatic hydrocarbons, despite having unsaturation, undergo mainly electrophilic substitution reactions.However, there are examples of aromatic hydrocarbons which do not contain a benzene ring but instead contain other highly unsaturated ring.To restore the aromatic character, ? -complex releases proton from sp3 hybridised carbon on attack by [AlCl4]– (in case of halogenation, alkylation and acylation) and [HSO4]– (in case of nitration).Benzene and benzenoid compounds show aromatic character.Hydrocarbons are classified as open chain saturated (alkanes) and unsaturated (alkenes and alkynes), cyclic (alicyclic) and aromatic, according to their structure.Aromatic hydrocarbons are immiscible with water but are readily miscible with organic solvents.Benzene ring is highly unsaturated but in a majority of reactions of aromatic compounds, the unsaturation of benzene ring is retained.Aromatic hydrocarbons are a special type of cyclic compounds.Aromatic compounds containing benzene ring are known as benzenoids and those not containing a benzene ring are known as non-benzenoids.Sigma complex or arenium ion loses its aromatic character because delocalisation of electrons stops at sp3 hybridised carbon.Aromatic hydrocarbons are non- polar molecules and are usually colourless liquids or solids with a characteristic aroma.