Aldehyde and ketone have same general formula for homologous series_________________?
Correct answer: C. CnH2nO
- A. CnH2nO2n
- B. CnH2n
- C. CnH2nO
- D. CnH2nOn+1
Explanation
Acyclic saturated aldehydes and ketones contain one carbonyl group and have the general formula CnH2nO. The oxygen count is one, not 2n or n+1, so option c matches the homologous series. Students may choose b by remembering the hydrocarbon formula for an alkene and forgetting the additional oxygen atom in carbonyl compounds.
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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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