Phenols
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Phenols are a class of chemical compounds consisting of a hydroxyl functional group (-OH) attached to an aromatic hydrocarbon group. The simplest of the class is phenol (C₆H₅OH). Although similar to alcohols, phenols have unique properties including relatively high acidities due to the aromatic ring tightly coupling with the oxygen and a relatively loose bond between the oxygen and hydrogen.

The original article can be found at: http://en.wikipedia.org/wiki/Phenols.
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