What is the IUPAC name of $(C H_{3})_{3} C C H_{2} C O O H$ ?

Hexanoic acid

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2,2,2-Trimethylpropanoic acid

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3,3-Dimethylbutanoic acid

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4-Methylpentanoic acid

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Solution

The correct option is C 3,3-Dimethylbutanoic acid
The longest parent carbon chain consists of 4 carbon atoms including the carboxyl carbon and one methyl group attached to the tertiary carbon. The other two methyl groups act as substituents on the carbon, which is now the third carbon. The preference is given to carboxylic group and numbering should start from there. The IUPAC name of given compound is 3,3-Dimethylbutanoic acid

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