What is pyrogallol?

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Pyrogallol belongs to phenol family. Its IUPAC name benzene-1,2,3-triol. It is used as a photographic film developer and in chemical synthesis. It is a good absorbent of oxygen gas and is therefore, used for determining the percentage of oxygen in gaseous mixtures. It is a white solid which turns grey on exposure to air. It is soluble in water.
Structure of pyrogallol is:



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