cetane number petroleum chemistry saturated alicyclic compounds unsaturated compounds exist cyclic derivatives stable rings contain five six carbon atoms large rings macrocycles smaller rings common smallest cycloalkane family three membered cyclopropane ch sub sub sub sub saturated cyclic compounds contain single bonds whereas aromatic rings alternating conjugated double bond cycloalkanes contain multiple bonds whereas cycloalkenes cycloalkynes aromatic compounds benzene one best known aromatic compounds one simplest stable aromatics aromatic hydrocarbons contain conjugated double
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