JEE Advanced 2017 · Paper 1 · Chemistry Q6 · Dronacharya Exams

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ChemistryMultiple correct+4 / -2Question 24 of 54

The IUPAC name(s) of the following compound is(are)

4-Chlorotoluene: a benzene ring with CH₃ and Cl para to each other.

A

1-chloro-4-methylbenzene

B

4-chlorotoluene

C

4-methylchlorobenzene

D

1-methyl-4-chlorobenzene

Answer and worked solution

Official answer: A, B

(A) 1-chloro-4-methylbenzene: benzene as the parent, with substituents in alphabetical order (chloro before methyl). Correct.
(B) 4-chlorotoluene: toluene is a retained IUPAC parent name, with Cl at C-4. Correct.
(C) "methylchlorobenzene" does not list the prefixes alphabetically. Incorrect.
(D) "1-methyl-4-chlorobenzene" gives the lower locant to methyl, but alphabetical order gives it to chloro. Incorrect.

(A), (B)

Topics:IUPAC nomenclature

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