[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][I]"}, {"from": "gpt", "value": "The molecule appears as a yellow liquid with a pungent odor. Denser than water and insoluble in water. Hence sinks in water. Vapors are heavier than air. Very irritating to skin, eyes and mucous membranes. Poisonous by ingestion and inhalation. Used to make other chemicals."}]