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Question

The correct IUPAC name is:
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A
3-carboxy-2-pentene
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B
2-ethilidene butanoic acid
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C
2-ethyl-2-butenoic acid
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D
3-ethyl-2-buten-4-oic acid
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Solution

The correct option is C 2-ethyl-2-butenoic acid
The correct IUPAC name for the given compound is 2-ethyl-2-butenoic acid.
The longest chain includes COOH functional group and C=C double bond. Numbering is started so that COOH group is numbered one.
An ethyl group is present on second C atom.

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