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What is the correct IUPAC name of the ketone shown?

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Correct Answer: A) 2,4-Dimethylhexan-3-one
The longest chain containing the carbonyl group has six carbons. Correct numbering gives the carbonyl at C-3 and methyl groups at C-2 and C-4, so the name is 2,4-dimethylhexan-3-one.