Aromatic compound
Aromatic compounds are compounds containing a planar set of atoms that are (in the classical sense) connected by single and double bonds alternating in a system of one or more closed rings. The most famous such compound is benzene.In modern terminology, they can be described as compounds in which a continuous, closed system of rings contains separate sets of sigma and pi electrons. The atomic orbitals forming the sigma system are sp2 hybridized[?], and those forming the pi system are pure p orbitals. The Hückel "4n+2" rule can be used to predict when aromatic behavior exists.
Properties Of Aromatic Compounds
- They have closed congugation.
- The Carbon Atoms are sp2 Hybrid,and have a planar structure.
- The Carbon-Hydrogen ratio is very small.
- They burn with a yellow sooty flame because of the low carbon-hydrogen ratio.
- They Undergo Electrophilic substitution reactions unlike Aliphatic Compounds which undergo Nucleophilic substitution reactions.
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