Study pyridine 's structure, basicity, and applications in pharmaceuticals, agriculture, and organic synthesis. Pyridine is a basic heterocyclic organic compound with the chemical formula C 5 H 5 N. It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom (=N−). It is a highly flammable, weakly alkaline, water-miscible liquid with a distinctive, unpleasant fish-like smell. Pyridine is colorless, but older or impure samples can appear yellow. The pyridine ring occurs in many commercial compounds, including agrochemicals, pharmaceuticals, and vitamins ... Pyridine is a colorless liquid of e.g. 115 °C. It is found in coal tar and is obtained from ammonia and acetylene. Pyridine is a colorless liquid and a heterocyclic molecule with the chemical formula C 5 H 5 N. It is an organic compound. Its structure resembles that of a benzene molecule. Unrefined coal tar is used to produce pyridine . Pyridine ’s simple derivatives are mostly stable in nature. It is also known as Azine. It has a sour smell and is a weak base that mixes with water. In this article, we will learn more about pyridine , its characteristics, structure, and uses of pyridine .