NEET 2001 Chemistry question

The incorrect IUPAC name is : -

(1) : 2-methyl-3-butanoneCorrect
(2) : 2, 3-dimethyl pentane
(3) : 4-methyl-2-pentyne
(4) : 2-bromo-3-chloro butane

Answer: (1)

Solution

(1) The ketone has a four-carbon chain. The principal functional group (C=O) must get the lowest locant: numbering from the end next to C=O makes C=O carbon 2, giving 3-methylbutan-2-one. The name 2-methyl-3-butanone gives the carbonyl the higher locant (3), so

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Question ID VK-088794