Identify the correct IUPAC name of the given compound:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 4-Methylpent-3-en-2-one
The longest chain containing the carbonyl group has 5 carbons → pent.
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The ketone group gets the lowest possible number → at carbon 2 → 2-one.
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The double bond is between C3 and C4 → 3-en.
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A methyl substituent is present at C4 → 4-methyl.
Hence, the full name is 4-Methylpent-3-en-2-one .
(“Mesityl oxide” is the common name, not the IUPAC name.)