Two or more compounds with the same molecular formula but with the atoms connected differently are referred to as

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Compounds with the same molecular formula but with different arrangements of atoms are called constitutional isomers. This is because the connectivity (or constitution) of the atoms differs between the isomers. Normal vs. branched alkanes refer to the structure of a specific type of isomer - alkanes - where normal alkanes are linear and branched alkanes have non-linear, branched chains. Functional groups are specific arrangements of atoms that give a compound its characteristic properties (e.g. carboxylic acid functional group). Conformations refer to the different orientations of a molecule's atoms due to rotation around single bonds, but do not involve different connectivity of atoms.

Two or More Compounds with the Same Molecular Formula but with the Atoms