The IUPAC name(s) of the following compound is(are)
- (A)1-chloro-4-methylbenzene✓ Correct
- (B)4-chlorotoluene✓ Correct
- (C)4-methylchlorobenzene
- (D)1-methyl-4-chlorobenzene
Answer: (A), (B)
Solution
The compound is para-chlorotoluene (methyl and chloro groups at positions 1 and 4 on benzene).
Option A: 1-chloro-4-methylbenzene is correct (numbering starts from Cl).
Option B: 4-chlorotoluene is correct (toluene with Cl at position 4).
Option C: 4-methylchlorobenzene is incorrect (chlorobenzene is the parent, but methyl should be numbered, not just stated as "4-methyl").
Option D: 1-methyl-4-chlorobenzene is incorrect (benzene derivatives don't use "1-methyl"; toluene is the parent when methyl is present).
Correct answers: A, B
Option A: 1-chloro-4-methylbenzene is correct (numbering starts from Cl).
Option B: 4-chlorotoluene is correct (toluene with Cl at position 4).
Option C: 4-methylchlorobenzene is incorrect (chlorobenzene is the parent, but methyl should be numbered, not just stated as "4-methyl").
Option D: 1-methyl-4-chlorobenzene is incorrect (benzene derivatives don't use "1-methyl"; toluene is the parent when methyl is present).
Correct answers: A, B
JEE Advanced · 2017 · 21 May 2017 · Paper 1 · One or more correct options