JEE Main Chemistry question

Which of the following compounds has incorrect IUPAC nomenclature?

(A)CH₃CH₂CH₂COOC₂H₅ — ethyl butanoate
(B)CH₃CH(CH₃)CH₂CHO — 3-methylbutanal
(C)CH₃CH(CH₃)COCH₂CH₃ — 2-methylpentan-3-one
(D)CH₃CH(CH₃)CH(OH)CH₃ — 2-methylbutan-3-olCorrect

Answer: (D)

Solution

In CH₃–CH(CH₃)–CH(OH)–CH₃, the hydroxyl (principal characteristic group) must receive the lowest possible locant. Numbering from the end nearer the OH gives it C2,

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Question ID VK-139006