Some carboxylic acids and their IUPAC names are given below. Which of the following is not correctly matched?

Formic acid - Methanoic acid

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Acetic acid - Ethanoic acid

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Iso-butyric acid - 2 - Methyl butanoic acid

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Malonic acid - Propandioic acid

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Solution

The correct option is C Iso-butyric acid - 2 - Methyl butanoic acid
Isobutyric acid is $(C H_{3})_{2} C H C O O H$ .
2 - Methyl butanoic acid is $C H_{3} - C H_{2} - C H (C H_{3}) - C O O H$
hence option (C) is the answer.

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