3d image of butene skeletal formula

butene butylene alkene crude oil catalytic cracking fractional distillation petroleum monomer polybutene polymer polypropylene substance material compound component agent reagent functional group precursor synthesis reaction production building block dangerously explosive flammable bleve dangerous fire exothermic detonation deflagration burn shock wave combustion lpg petrol gasoline fuel petrochemical molecule molecular formula skeletal structural structure 3d