The correct IUPAC name of is:

2-methylenebutanoic acid

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2-ethylprop-2-enoic acid

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2-carboxybutene

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None of the above

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Solution

The correct option is D 2-ethylprop-2-enoic acid
According to I.U.P.A.C nomenclature the first priority should be given to the carboxylic group, then to the double bond. Total number of carbon atoms present in the backbone is 3. So the name of the compound should be 2-ethylprop-2-enoic acid. So the correct option is B

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