Benzoquinone (C₆H₄O₂) is aquinone with a singlebenzene ring. There are 2 (out of 3 hypothetical) benzoquinones:

• 1,4-Benzoquinone, most commonly, right image (alsopara-benzoquinone,p-benzoquinone,para-quinone, or just quinone)
• 1,2-Benzoquinone, less commonly, left image (alsoortho-benzoquinone,o-benzoquinone,ortho-quinone)

• 1,3-benzoquinone "does not exist, because its structure would be nonplanar and highly strained",^[1] though derivatives are known.

An alkylatedp-benzoquinone has been found in therhizomes ofIris kemaonensis.^[2]

• Arene substitution pattern

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