In chemistry, isomerization or isomerisation is the transformation of a molecule into a different isomer . In some molecules and under some conditions, isomerisation occurs spontaneously. Many isomers are equal or roughly equal in bond energy, and so they interconvert relatively freely. When the isomerisation occurs intramolecularly it's considered a rearrangement reaction. Instances of Isomerization Isomerisations in hydrocarbon cracking. This is usually employed in organic chemistry, where fu… (More on Isomerisation)