Question

 The major product 'P' and 'Q' are

• A. Option a
• B. Option b
• C. Option c
• D. Option d

Hint:

Cumene process:
Benzene + propyl halide \( \rightarrow \) cumene (rearranged)
Oxidation + acid cleavage \( \rightarrow \) phenol + acetone
Classic industrial reaction

Answer 1

The Correct Option is B

Concept: Two-step reasoning:  Friedel–Crafts alkylation rearrangement  Cumene process (industrial phenol synthesis)  
Step 1: Friedel–Crafts alkylation CH$_3$CH$_2$CH$_2$Cl with AlCl$_3$ forms carbocation. Primary carbocation rearranges to more stable secondary carbocation: \[ \text{CH}_3\text{CH}^+\text{CH}_3 \] Thus benzene gives isopropylbenzene (cumene).
 Step 2: Oxidation Cumene on oxidation with O$_2$/OH$^-$ forms cumene hydroperoxide. Acidic cleavage gives: \[ \text{Phenol} + \text{Acetone} \] This is the well-known cumene process.
 Conclusion: \[ P = \text{Isopropylbenzene}, \quad Q = \text{Acetone} \]