Isopropylbenzne on air oxidation in the presence of dilute acid gives

Options

A. `C_(6)H_(5)COOH`
B. `C_(6)H_(5)COCH_(3)`
C. `C_(6)H_(5)CHO`
D. `C_(6)H_(5)OH`

Explanation

To solve the question regarding the products formed when isopropylbenzene (cumene) undergoes air oxidation in the presence of dilute acid, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compound**:
Isopropylbenzene is also known as cumene. Its chemical structure is represented as C6H5-CH(CH3)2.

2. **Understand the Reaction**:
When cumene is subjected to air oxidation, it reacts with oxygen. The presence of dilute acid facilitates this reaction.

3. **Formation of Cumene Hydroperoxide**:
The initial product of the oxidation of cumene is cumene hydroperoxide. The reaction can be summarized as:
\[ \text{C6H5-CH(CH3)2} + \text{O2} \rightarrow \text{C6H5-CH(CH3)2-O-OH} \quad (\text{Cumene Hydroperoxide}) \]

4. **Hydrolysis of Cumene Hydroperoxide**:
When cumene hydroperoxide is treated with dilute acid (H2O and H+), it undergoes hydrolysis. This reaction leads to the formation of phenol and acetone:
\[ \text{C6H5-CH(CH3)2-O-OH} + \text{H2O} \rightarrow \text{C6H5OH} + \text{CH3COCH3} \]

5. **Identify the Final Products**:
The final products of this reaction are phenol (C6H5OH) and acetone (CH3COCH3).

6. **Evaluate the Options**:
Now, we check the options provided in the question:
- Option 1: C6H5COOH (benzoic acid) - Incorrect
- Option 2: C6H5COCH3 (acetophenone) - Incorrect
- Option 3: C6H5CHO (benzaldehyde) - Incorrect
- Option 4: C6H5OH (phenol) - Correct

### Conclusion:
The correct answer is that isopropylbenzene (cumene) on air oxidation in the presence of dilute acid gives phenol and acetone.

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