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Which of the following is an incorrect name for the following compound?

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in Chemistry – Class 12 by (188k points)
Which of the following is an incorrect name for the following compound?

(a) α-Methylpropionic acid

(b) β-Methylbutyric acid

(c) Isovaleric acid

(d) 3-Methylbutanoic acid

I got this question in an internship interview.

Question is from Nomenclature and Structure of Carboxyl Groups topic in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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The correct answer is (a) α-Methylpropionic acid

For explanation: The longest parent chain of carbon atoms (including the first carboxyl carbon) is four. The methyl group is substituted at the third carbon, also known as the beta carbon. Isovaleric acid is also a common name for this structure.

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