Chain isomers have components of the chain distinctly ordered to create different structures. Here, 2-ethyl-butane has become 2-methyl-propane:
Positional isomers occur when a functional group changes position on the chain. In the diagram, 2-hydroxy-propane has become 3-hydroxy-propane:
Functional group isomerism is when a functional group splits up and becomes a different group. Here, butanol has become ethoxyethane:
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