n-Butylbenzene on oxidation with hot alkanine `KMnO_4` gives :

Explanation

To solve the question regarding the oxidation of n-butylbenzene with hot alkaline KMnO4, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of n-Butylbenzene**:
- n-Butylbenzene consists of a benzene ring (C6H5) with a butyl group (C4H9) attached to it. The structure can be represented as:
\[
\text{C}_6\text{H}_5\text{-C}_4\text{H}_{9}
...