COMEDK20269 May 2026Morning ShiftChemistryHydrocarbonsActual
Select the reagents needed to convert Benzene to 4–Bromophenylpropene in the correct sequential order. (A). Cl ₂/ (B). ( CH ₃)₂ -CHCl /anhyd. AlCl ₃ (C). Alc. KOH (D). Br ₂ / Fe
Options
- AD, C, A, B
- BB, D, A, C
- CD, A, C, B
- DA, C, B, D
Correct answer
B. B, D, A, C
Step-by-step solution
The conversion of benzene to 4-bromophenylpropene involves the following sequential steps: 1. Friedel-Crafts Alkylation (Reagent B): Benzene reacts with isopropyl chloride in the presence of anhydrous AlCl ₃ to form isopropylbenzene (cumene). C ₆ H ₆ + ( CH ₃)₂ CHCl anhyd. AlCl ₃ C ₆ H ₅ CH ( CH ₃)₂ 2. Electrophilic Aromatic Substitution (Reagent D): Isopropylbenzene undergoes bromination with Br ₂/ Fe . The isopropyl group is ortho/para-directing. Due to steric hindrance at the ortho position, the major product is