A homologous series is a family of compounds in which each member
Correct answer: B. differs from the next by a CH2 group and shares the same general formula and functional group
- A. has the same molecular formula
- B. differs from the next by a CH2 group and shares the same general formula and functional group
- C. has the same physical properties
- D. contains the same number of carbon atoms
Explanation
Members share a general formula and a functional group, so their chemical properties are similar, while physical properties such as boiling point change gradually as the chain lengthens. The alkanes, with the general formula CnH2n+2, are the simplest example. Compounds with the same molecular formula but different structures are isomers, not members of a series.
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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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