Which of the following is not a fatty acid ?
Correct answer: C. Phthalic acid
- A. Propanoic acid
- B. Acetic acid
- C. Phthalic acid
- D. Butanoic acid
Explanation
Phthalic acid is benzene-1,2-dicarboxylic acid, an aromatic dicarboxylic acid rather than a fatty acid. Propanoic, acetic and butanoic acids are simple aliphatic carboxylic acids commonly included among short-chain fatty acids. The likely mistake is choosing acetic acid because it is not usually thought of as a fatty acid, although it belongs to the same aliphatic acid 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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