The correct IUPAC name of given compouns is:

2-Methylbutanoic acid

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2-Ethylprop-2-enoic acid

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2-Carboxybutane

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None of the above

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Solution

The correct option is B 2-Ethylprop-2-enoic acid
The principal chain should contain maximum number of multiple bond in the longest chain bearing principal functional group.
Here carboxylic acid is the principal functional group and ethyl group is substituent on the chain.

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