Chloroform

Chloroform is a colorless, dense, sweet-smelling, volatile organic liquid (trichloromethane) used as a solvent and chemical precursor, known historically as an anesthetic but now restricted due to its toxicity, potential carcinogenicity, and ability to cause liver/kidney damage and central nervous system effects. It's heavier than water, slightly soluble, and non-flammable under normal conditions, though it produces toxic fumes when heated.