[{"from": "human", "value": "Provide a description of this molecule. [C][=C][Cl]"}, {"from": "gpt", "value": "The molecule is a monohaloethene that is ethene in which one of the hydrogens has been replaced by a chloro group. It has a role as a carcinogenic agent. It is a member of chloroethenes, a monohaloethene and a gas molecular entity."}]