Structural isomerism
Structural isomerism is a form of isomerism in which molecules with the same molecular formula have atoms bonded together in different orders (as opposed to stereoisomerism.)
Chain isomerismChain isomers have components of the chain distinctly ordered to create different structures. Here, 2-ethyl-butane has become 2-methyl-propane:
Position isomerismPositional isomers occur when a functional group changes position on the chain. In the diagram, 2-hydroxy-propane has become 3-hydroxy-propane:
Functional group isomerismFunctional group isomerism is when a functional group splits up and becomes a different group. Here, butanol has become ethoxyethane:
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