The organic chemical compound benzene (CASRN 71-43-2) has the formula C6H6. It is a colorless, extremely fl ammable liquid with a pleasant odor. At room temperature, benzene is a colorless or light-yellow liquid substance. It is largely utilized as a solvent in the chemical and pharmaceutical industries, as a starting material and intermediary in the production of several compounds, and as a component of gasoline. Both natural and man-made processes create benzene. It is a naturally occurring component of crude oil, which is the primary source of benzene today. Additional natural causes include volcanic gas releases and forest fi res. Benzene can also be used as a solvent to dissolve organic compounds such as fats, pharmaceuticals, plastics, resins, rubbers, and paints.