The major product 'P' and 'Q' are
The major product 'P' and 'Q' are
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Benzene + propyl halide \( \rightarrow \) cumene (rearranged)
Oxidation + acid cleavage \( \rightarrow \) phenol + acetone
Classic industrial reaction
- Option a
- Option b
- Option c
- Option d
The Correct Option is B
Solution and Explanation
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: \[ P = \text{Isopropylbenzene}, \quad Q = \text{Acetone} \]
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