The IUPAC name for the compound $C H_{3} - C (C H_{3}) = C H - C O O H$ is:

2-Methyl-2-butenoic acid

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3-Methyl-3-butenoic acid

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3-Methyl-2-butenoic acid

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2-Methyl-3-butenoic acid

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Solution

The correct option is C 3-Methyl-2-butenoic acid
The numbering is done from right-hand side as carboxylic acid is present in right-hand side. There is double bond present at the C-2 position and methyl group at C-3 position.
Thus, the IUPAC name is: 3-methyl-2-butenoic acid

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