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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm105

The IUPAC name of $CH X_{3} - CH = CH - CH (CH X_{3}) - CH X_{2} - COOH$ is:

A3-methylhex-4-en-1-ol
B3-methylhex-2-enoic acid
C3-methylhex-4-enoic acid
D4-methylhex-2-enoic acid

Answer: C

The acid is the principal group, so the longest chain containing the COOH carbon (C-1) has six carbons:

HOOC - CH X_{2} - CH (CH X_{3}) - CH = CH - CH X_{3}

. The methyl is on C-3 and the double bond is C-4=C-5. The name is 3-methylhex-4-enoic acid.

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