....H....H....H....H
....|.....|…..|…..|
H-C==C----C----C-H
.....….....…..|.....|
.................H.....H
butan-1-ene/butene/but-1-ene
....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*
