Structural Isomerism
Isomerism in which the compounds differ in the order in which their atoms are connected.
Unit
Dimensionless
In depth
Because the bonding framework itself differs, structural isomers usually have quite different physical and chemical properties and can be separated by ordinary means. The category is subdivided into chain, position, functional group, metamerism and tautomerism.
Examples in the real world
Butane and 2-methylpropane; ethanol and dimethyl ether, both C₂H₆O.