JEE Main 2002 Chemistry question

Which of the following compounds has wrong IUPAC name ?

(1)CH_3-CH_2-CH_2-COO-CH_2CH_3 \longrightarrow ethyl butanoate
(2) 3-methyl-butanal
(3) 2-methyl-3-butanolCorrect
(4) 2-methyl-3-pentanone

Answer: (3)

Solution

In (3), the main chain has 4 carbons with OH and CH₃ substituents. Numbering must give the principal functional group (–OH) the lowest locant: OH on C-2, CH₃ on C-3, so the correct name is 3-methyl-2-butanol (3-methylbutan-2-ol);

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Question ID VK-037942