The IUPAC name of (CH₃)₂CHCH₂COCH(CH₃)₂ is:
AIsobutyl isopropyl ketone (common name only)
B2,4-dimethylpentan-3-one
C2,5-dimethyl-hexan-3-one (same thing — correctly named as 6-carbon chain with C=O at C3, methyls at C2 and C5)
D2,5-dimethylhexan-3-one
Answer & Solution
Correct answer: D. 2,5-dimethylhexan-3-one
Longest chain through C=O: 6 carbons. C=O at C3 → hexan-3-one. Methyl at C2 (from one isopropyl) and C5 (from the other) → **2,5-dimethylhexan-3-one**. (Common name 'isobutyl isopropyl ketone' is also accepted but IUPAC is preferred in NEET.)
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