Which of the following is an unsaturated carboxylic acid___________________?
Correct answer: D. maleic acid
- A. malonic acid
- B. oxalic acid
- C. succinic acid
- D. maleic acid
Explanation
Maleic acid is but-2-enedioic acid, containing a carbon-carbon double bond, so it is an unsaturated dicarboxylic acid. Malonic, oxalic and succinic acids contain no carbon-carbon double bond. The likely wrong choice is succinic acid because it is also a dicarboxylic acid, but it is saturated.
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About Reactivity of Carboxylic Acids
Carboxylic acids show acidic behaviour because their carboxylate ions are resonance-stabilised, and electron-withdrawing groups can change their strength. Reactions include neutralisation, esterification, formation of acid chlorides and amides, reduction, decarboxylation and substitution at the acyl carbon, which differs from the reactions of phenols.
Practise Carboxylic Acids
550 free Carboxylic Acids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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