In this variety of structural isomerism, the isomers contain different functional groups - that is, they belong to different families of compounds (different homologous series). For example, a molecular formula C3H6O could be either propanal (an aldehyde) or propanone (a ketone).
So for this case, the structural isomers of c3h7br are:
CH3CH2CH2Br
CH3CHBrCH3
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