2-Butene is an acyclic alkene with four carbon atoms. It is the simplest alkene to shown cis/trans-isomerism (also known as (E/Z)-isomerism); that is, it exists as two geometrical isomers cis-2-Butene ((Z)-2-butene) and trans-2-Butene ((E)-2-butene). It is a petrochemical, produced by the catalytic cracking of crude oil. Its main uses are in the production of gasoline (petrol) and butadiene,. although some 2-butene is also used to produce the solvent butanone (methyl ethyl ketone, MEK) via hydr… (More on 2-butene)