All members of homologous series have different __________?
Correct answer: C. physical properties
- A. chemical properties
- B. functional group
- C. physical properties
- D. all of them
Explanation
Members of a homologous series have the same functional group and similar chemical properties, but successive members differ by a CH2 unit and therefore have different physical properties such as boiling point. Students may choose “chemical properties” by overlooking the word “different,” since the chemical properties are generally similar, not different.
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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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