positional isomer

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Related to structural isomerism: chain isomerism

positional isomer

[pə′zish·ən·əl ′ī·sə·mər]
(chemistry)
One of a set of structural isomers which differ only in the point at which a side-chain group is attached.
(organic chemistry)
Constitutional isomer having the same functional group located in different positions along a chain or in a ring.
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