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General Formula& &&&Nomenclature Types of Ketones 1) Aliphatic Ketones Contain open carbon chains (non-aromatic) General formula: R-CO-R' (R, R' alkyl groups) Examples: CHICOCH Propanone (Acetone) CHCOCH Butanone 2) Aromatic Ketones Contain at least one benzene ring attached to the carbonyl group General formula: Ar-CO-R or Ar-CO-Ar' (Araryl group) Examples: CH.COCH: Acetophenone CHCOCH Benzophenone Note: Aliphatic open-chain structure Aromatic contains benzene ring