Phthalic Acid (Ortho Meta Para)
(Benzene-1,2-dicarboxylic acid) is an aromatic dicarboxylic acid, with formula C6H4(COOH)2. It is an isomer of isophthalic acid and terephthalic acid.
Picric acid is the chemical compound formally called 2,4,6-trinitrophenol (TNP). This, a yellow crystalline solid, is one of the most acidic phenols.
Pimelic acid is the organic compound with the formula HO2C(CH2)5CO2H. Derivatives of pimelic acid are involved in the biosynthesis of the amino acid called lysine.
Glutaric acid is the organic compound with the formula HO2C(CH2)3CO2H. Although the related "linear" dicarboxylic acids adipic and succinic acids are water-soluble only to a few percent at room temperature, the water-solubility of glutaric acid is over 50%.
A red crystalline acid C6H5N3O5 obtained by reducing picric acid and used chiefly in making azo dyes