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Which of the following is not a dicarboxylic acid?

(a) Malonic acid

(b) Glutaric acid

(c) Adipic acid

(d) Carballylic acid

I had been asked this question in unit test.

I'd like to ask this question from Nomenclature and Structure of Carboxyl Groups in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Right choice is (d) Carballylic acid

To elaborate: Malonic acid, glutaric acid and adipic acid are dicarboxylic acids with 3, 5 and 6 carbon atoms in their structures respectively. Carballylic acid, also known as tricarballylic acid is a tricarboxylic acid having 3 carbon atoms excluding the three carboxyl carbons in its structure. Its IUPAC name is Propane-1,2,3-tricarboxylic acid.

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