Benzoquinones
Encyclopedia
Benzoquinone is a quinone
Quinone
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure."...

 with a single benzene ring, of which there are only two:
  • 1,4-Benzoquinone
    1,4-Benzoquinone
    1,4-Benzoquinone, commonly known as para-quinone, is a chemical compound with the formula C6H4O2. In a pure state, it forms bright-yellow crystals with a characteristic irritating odor, resembling that of chlorine, bleach, and hot plastic. Impure samples are often dark-colored due to the presence...

    , most commonly (also para-benzoquinone, p-benzoquinone, para-quinone, or just quinone)
  • 1,2-Benzoquinone
    1,2-Benzoquinone
    1,2-Benzoquinone, also called ortho-benzoquinone or cyclohexa-3,5-diene-1,2-dione, is a ketone, with formula C6H4O2. It is one of the two isomers of quinone, the other being 1,4-benzoquinone....

    , less commonly (also ortho-benzoquinone, o-benzoquinone, ortho-quinone)
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