JEE Main Chemistry question

Which of the following names is **not** correct according to the IUPAC system?

(A)2-Methyl-3-phenylpentane
(B)5-Oxohexanoic acid
(C)1-Bromoprop-2-eneCorrect
(D)4-Bromo-2,4-dimethylhexane

Answer: (C)

Solution

For CH₂=CH–CH₂Br, the carbon–carbon double bond (a skeletal unsaturation) must be given priority for the lowest locant over a substituent prefix such as bromo. Numbering from the alkene end gives the double bond locant 1 (set {1,3}: double bond

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Question ID VK-139948