[{"from": "human", "value": "What can you tell me about this molecule? [C][=C]"}, {"from": "gpt", "value": "The molecule appears as a colorless gas with a sweet odor and taste. It is lighter than air. It is easily ignited and a flame can easily flash back to the source of the leak. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. Can cause explosion."}]