Moderate

In homologous series there is the difference of mass between adjacent members.

Correct answer: A. 14amu

  • A. 14amu
  • B. 12amu
  • C. 18amu
  • D. 22amu

Explanation

Adjacent members of a homologous series differ by one CH2 group, whose mass is 12 amu + 2 amu = 14 amu. Students may choose 12 amu by counting only the carbon atom and forgetting the two hydrogen atoms.

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About Classification of Organic Compounds

Organic compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.

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