![]() They are further classified into the following two categories: The heteroatoms found in these compounds are oxygen, nitrogen and sulphur, boron, silicon etc. (2) Bicyclic or tricyclic aromatic compoundsĪromatic compounds which do not contain a benzene ring but instead contain other highly unsaturated rings are called n on-benzenoid aromatic compounds.Ĭyclic compounds containing one or more heteroatoms in their rings are called heterocyclic compounds. (1) Benzenoid aromatic compounds: Organic compounds containing one or more fused or isolated benzene rings and their functionalized derivatives are called benzenoid aromatic compounds.ĭepending upon the number of benzene rings fused together, benzenoid compounds may be monocyclic, bicyclic, tricyclic aromatic compounds. ![]() These are special type of cyclic unsaturated compounds.The name aromatic for this class of cyclic unsaturated compounds has been derived from the Greek word aroma meaning fragrant smell since most of the compounds discovered has pleasant smell. ![]() carbon atoms.These are further divided into the following two sub-classes.Ĭarbocyclic compounds which resemble aliphatic compounds in most of their properties are called aliphatic compounds. (1) Homocyclic or carbocyclic compounds: These compounds contain rings which are made up of only one kind of atoms i.e. ![]() These compounds contain one or more closed chains or rings of atoms in their molecules.ĭepending upon the constitution of the ring, these are further divided into following two categories: Open chain compounds are also called aliphatic compounds since the earlier compounds of this class were obtained either from animals or vegetable fats. ![]()
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