Quinone
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Quinone is generally defined as an aromatic benzene molecule containing a double ketone functional group. Quinone is a common constituent of biologically relevant molecules (e.g. Vitamin K1 is phylloquinone) and serve as electron acceptors in electron transport chains such as those in Photosystems I & II of photosynthesis, and aerobic respiration.
Benzoquinone refers to either of two cyclic isomers with the chemical formula C6H4O2: orthobenzoquinone and parabenzoquinone.
 orthobenzoquinone |
Missing image Parabenzoquinone.png Image:parabenzoquinone.png parabenzoquinone |
The word quinone can also be used for a family of molecules having a cycle with two double bonds similar to benzoquinone.