Aromatic example sentences

Sigma complex or arenium ion loses its aromatic character because delocalisation of electrons stops at sp3 hybridised carbon.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.Aromatic hydrocarbons are a special type of cyclic compounds.Aromatic hydrocarbons are immiscible with water but are readily miscible with organic solvents.For alkenes, alkynes and aromatic hydrocarbons, spring models can be constructed.Aromatic hydrocarbons, despite having unsaturation, undergo mainly electrophilic substitution reactions.Since most of them possess pleasant odour (Greek; aroma meaning pleasant smelling), the class of compounds was named as 'aromatic compounds'.However, there are examples of aromatic hydrocarbons which do not contain a benzene ring but instead contain other highly unsaturated ring.Benzene and benzenoid compounds show aromatic character.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).Aromaticity, the property of being aromatic is possessed by compounds having specific electronic structure characterised by Hückel (4n+2)? electron rule.Aromatic hydrocarbons are non- polar molecules and are usually colourless liquids or solids with a characteristic aroma.The remaining electron at each carbon is delocalised in molecular orbitals, which in turn give aromatic character to molecule.Hydrocarbons are classified as open chain saturated (alkanes) and unsaturated (alkenes and alkynes), cyclic (alicyclic) and aromatic, according to their structure.Aromatic compounds containing benzene ring are known as benzenoids and those not containing a benzene ring are known as non-benzenoids.