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JEE Main levelSingle correct optionDifficulty 2 of 3nm102

The IUPAC name of $CH X_{3} - CH (Br) - CH (Cl) - CH X_{3}$ is:

A2-bromo-3-chlorobutane
B2-chloro-3-bromobutane
C3-bromo-2-chlorobutane
D1-bromo-2-chloro-1-methylpropane

Answer: A

Both numberings give the locant set {2,3}, so the tie is broken in favour of the prefix cited first alphabetically. Bromo precedes chloro, so bromo gets C-2. The name is 2-bromo-3-chlorobutane.

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