NEET2026ChemistryChapterActual
Benzene reacts with n -propyl chloride in the presence of anhydrous AlCl ₃ to form compound P . Compound P is then treated with Br ₂ in the presence of FeBr ₃ to yield compound Q as the major product. Identify compound Q .
Options
- A1-Bromo-4-propylbenzene
- B1-Bromo-2-isopropylbenzene
- C1-Bromo-4-isopropylbenzene
- D(3-Bromopropyl)benzene
Correct answer
C. 1-Bromo-4-isopropylbenzene
Step-by-step solution
Benzene reacts with n -propyl chloride in the presence of anhydrous AlCl ₃ via Friedel-Crafts alkylation. The initially formed primary carbocation ( CH ₃ CH ₂ CH ₂^+ ) undergoes a 1,2-hydride shift to form a more stable secondary carbocation ( CH ₃ CH ^+ CH ₃ ). Electrophilic attack of this secondary carbocation on benzene yields isopropylbenzene (cumene) as compound P . Bromination of isopropylbenzene with Br ₂ and FeBr ₃ undergoes electrophilic aromatic substitution. The isopropyl group is an ortho/para directing