Benzene `+Cl-CH_(2)CH_(2)CH_(3)overset(AlCl_(3))(rarr) P underset((ii)H_(2)O)overset((i)O_(2)//Delta)(rarr)Q+`
Phenol The major products P and Q are `:`

Options

A.
B.
C.
D.

Answer

To solve the given problem step by step, we will analyze the reactions involved and identify the major products P and Q.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants are benzene (C₆H₆) and n-propyl chloride (Cl-CH₂CH₂CH₃).

2. **Reaction with Aluminium Chloride**:
- When n-propyl chloride reacts with aluminium chloride (AlCl₃), it forms a carbocation. The reaction can be represented as:
\[ \text{Cl-CH}_2\text{CH}_2\text{CH}_3 + \text{AlCl}_3 \rightarrow \text{AlCl}_4^- + \text{CH}_3\text{CH}^+\text{CH}_2 \]
- The n-propyl carbocation (CH₃CH₂CH₂⁺) is less stable, so a 1,2-hydride shift occurs to form a more stable isopropyl carbocation (CH₃C⁺HCH₃).

3. **Electrophilic Aromatic Substitution**:
- The isopropyl carbocation then reacts with benzene through electrophilic aromatic substitution:
\[ \text{C}_6\text{H}_6 + \text{CH}_3\text{C}^+\text{HCH}_3 \rightarrow \text{P (isopropylbenzene)} \]
- The product P is isopropylbenzene, also known as cumene (C₆H₅C(CH₃)₂).

4. **Oxidation Reaction**:
- The next step involves the oxidation of isopropylbenzene (P) with O₂ at elevated temperatures (368-408 K). This leads to the formation of cumene hydroperoxide:
\[ \text{P} + \text{O}_2 \rightarrow \text{Cumene hydroperoxide} \]

5. **Hydrolysis**:
- The cumene hydroperoxide is then treated with dilute H₂SO₄ (water), which leads to the cleavage of the hydroperoxide to form phenol and acetone:
\[ \text{Cumene hydroperoxide} + \text{H}_2\text{O} \rightarrow \text{Q (acetone)} + \text{Phenol} \]

6. **Identify the Products**:
- The major products are:
- P: Isopropylbenzene (Cumene)
- Q: Acetone (CH₃C(=O)CH₃)

### Final Answer:
- The major products P and Q are:
- P: Isopropylbenzene (Cumene)
- Q: Acetone