Cumene on treatment with `KMnO_(4)` gives -

Options

A.
B.
C.
D.

Answer

To solve the question regarding the treatment of cumene with KMnO₄, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Cumene:**
- Cumene, also known as isopropylbenzene, has the following structure:
\[ \text{C}_6\text{H}_5\text{C}(\text{CH}_3)_2 \]
- This can be represented as:
```
CH3
|
C6H5-C
|
H
```

2. **Understand the Oxidation Process:**
- KMnO₄ is a strong oxidizing agent. When cumene is treated with KMnO₄, it will oxidize the alkyl side chain.
- In this case, cumene has a benzylic hydrogen (the hydrogen attached to the carbon adjacent to the benzene ring), which is susceptible to oxidation.

3. **Oxidation of the Side Chain:**
- The oxidation of the side chain (isopropyl group) will convert it into a carboxylic acid.
- The reaction can be summarized as:
\[ \text{C}_6\text{H}_5\text{C}(\text{CH}_3)_2 \xrightarrow{KMnO_4} \text{C}_6\text{H}_5\text{COOH} \]

4. **Formation of Benzoic Acid:**
- After the oxidation, the product formed is benzoic acid (C₆H₅COOH).
- The reaction can be completed by adding a dilute acid (like H₂SO₄) to protonate the carboxylate ion formed during the oxidation.

5. **Final Product:**
- Therefore, the final product of the reaction of cumene with KMnO₄ is benzoic acid.

### Final Answer:
Cumene on treatment with KMnO₄ gives **benzoic acid (C₆H₅COOH)**.

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