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JEE Main levelSingle correct optionDifficulty 2 of 3nm100

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

A3-methylpentan-2-one
B2-methylpentan-3-one
C4-methylpentan-2-one
D2-methylpentan-4-one

Answer: C

The longest chain has five carbons, and the ketone must get the lowest locant, so numbering starts at the

CH X_{3} - CO

end (C=O is C-2). The methyl branch is then on C-4. The name is 4-methylpentan-2-one.

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