Compounds that differ by a –CH₂– unit belong to which type of chemical grouping?
Homologous series
A homologous series is a family of organic compounds with the same functional group and the same general formula, in which each member differs from the next by a -CH2- unit.
For example, methane, ethane and propane differ successively by -CH2-, and their physical properties change gradually along the series.
Structural isomers have the same molecular formula, not a fixed difference; a functional group is the reactive part of a molecule, not a grouping of compounds.
Hence, the answer is homologous series.
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