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What is the difference in molecular mass between two successive members of a homologous series?

Answer and explanation

Correct answer: Fourteen units

Successive members of a homologous series differ by one –CH₂– unit in their molecular formula. The relative molecular mass of carbon is 12 and that of two hydrogen atoms is 2, so the increase is 12 + 2 = 14 units. This constant difference is a defining pattern of homologous series. Ten, two, and eighteen do not represent the mass of the added CH₂ group. Therefore, option A is correct.

Related tags

Class 10 ScienceCarbon CompoundsHomologous SeriesMolecular MassCarbon And Its CompoundsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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