The common thing in phthalic acid and oxalic acid is that both are_________________?
Correct answer: B. Dicarboxylic
- A. Aromatic
- B. Dicarboxylic
- C. Hydrocarbons
- D. Strong acids
Explanation
Phthalic acid is benzene-1,2-dicarboxylic acid and oxalic acid is ethanedioic acid, so each contains two -COOH groups and is dicarboxylic. They are not both aromatic, because oxalic acid has no benzene ring, and neither is a strong acid. The likely mistake is choosing aromatic by noticing the benzene ring in phthalic acid while ignoring oxalic acid.
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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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