Editing Butene (section)

==Isomers==
Among the molecules which have the [[chemical formula]] {{chem2|C4H8}} four [[isomers]] are [[alkenes]]. All four of these [[hydrocarbons]] have four [[carbon]] [[atom]]s and one [[double bond]] in their [[molecule]]s, but have different [[chemical structure]]s. The [[IUPAC]] and common names, respectively, of these [[chemical compound]]s are:
{| class="wikitable" style="text-align:center;"
! Common name(s)
! IUPAC name
! Structure
! Skeletal formula
! 3D model
|-
| [[1-butene]], α-butylene
| But-1-ene
| [[Image:1-butene.svg|class=skin-invert|210px]]
| [[Image:1-Butene.svg|class=skin-invert|150px]]
| [[Image:But-1-ene-3D-balls.png|150px]]
|-
| [[cis-2-butene]], ''cis''-β-butylene
| (2''Z'')-but-2-ene
| [[Image:Cis-2-butene.svg|class=skin-invert|170px]]
| [[Image:Cis-but-2-ene-2D-skeletal.png|class=skin-invert|120px]]
| [[Image:Cis-but-2-ene-3D-balls.png|150px]]
|-
| [[trans-2-butene]], ''trans''-β-butylene
| (2''E'')-but-2-ene
| [[Image:Trans-2-butene.svg|class=skin-invert|170px]]
| [[Image:Trans-but-2-ene-2D-skeletal.png|class=skin-invert|120px]]
| [[Image:Trans-but-2-ene-3D-balls.png|150px]]
|-
| [[isobutene]], isobutylene
| 2-methylprop-1-ene
| [[Image:Methylpropene.svg|class=skin-invert|145px]]
| [[Image:Isobutylene.svg|class=skin-invert|100px]]
| [[Image:Isobutylene-3D-balls.png|120px]]
|}

In the chemical structures above, the small blue numbers in the structure images are the numbering of the atoms in the main backbone chain of the molecules. Other organic compounds have the formula C<sub>4</sub>H<sub>8</sub>, namely [[cyclobutane]] and [[methylcyclopropane]], but are not alkenes and do not fall under the name ''butene''. There are also cyclic alkenes with four carbon atoms overall such as [[cyclobutene]] and two isomers of [[methylcyclopropene]], but they do not have the formula C<sub>4</sub>H<sub>8</sub> and are not discussed here.