[{"from": "human", "value": "Provide a description of this molecule. [C][=C][Cl]"}, {"from": "gpt", "value": "The molecule is a man-made organic compound, formed when other substances such as trichloroethane, trichloroethylene, and tetrachloroethylene are broken down. In its monomer form it is acutely hazardous, thus it is primarily used for the production of polymers. At room temperature it is a flammable, colorless gas with a sweet odor, but it is easily condensed and usually stored as a liquid. It is one ingredient of cigarette.(L3)"}]