....H....H....H....H ....|.....|…..|…..| H-C----C==C----C-H ....|….....…........| ....H..................H butan-2-ene/but-2-ene These are the structural isomers of butene.The geometric isomers include trans-but-2-ene and cis-but-2-ene. HOPE THIS HELPS *WINK*