Properties and Uses of Catechol: It is a colourless crystalline solid, melting points 105°C. it is soluble in water. It is exaggerated on exposure to light and air. It reacts as a reducing agent as it decreases Tollen's reagent in cold and Fehling's solution on high temperature. With silver oxide it is oxidized to o-benzoquinone.

         It forms insoluble lead salt (white ppt.) when treated with lead acetate solution and gives green colour with FeCl₃ which changes to red on adding Na₂CO₃ solution. It forms alizarin dye stuff when condensed with phthalic anhydride in the presence of sulphuric acid.

Uses : It finds use as photographic developer, in the manufacture of alizarin and adrenaline hormone and as an antioxidant (inhibitor in auto oxidation) for preserving gasoline.

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