Correct IUPAC Name of given compound :

3-Ethenyl-2-methylhexa-2,5-dienoicacid

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2-Methyl-3-ethenylhexa-2,5-dien-1-oic acid

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3-Ethenyl-2-methyhexa-2,5-dien-1-carboxylicacid

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2-Methyl-3-eth(-2-enyl)hexa-2,5-dienoicacid

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Solution

The correct option is B 3-Ethenyl-2-methylhexa-2,5-dienoicacid
The functional group on the first priority in the given compound is a carboxylic acid.

So the parent chain must contain a carboxylic group.

And also we will start numbering from the carboxylic group's Carbon and here the longest chain contain 6-Carbon.

Thus the IUPAC name is 3-Ethenyl-2-methylhexa-2,5-dienoicacid.

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