Ethyl benzene on oxidation with `KMnO_(4)` gives:

Explanation

To solve the question of what ethyl benzene gives upon oxidation with KMnO4, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Ethyl Benzene**:
Ethyl benzene consists of a benzene ring (C6H5) with an ethyl group (C2H5) attached to it. The molecular formula can be represented as C6H5-CH2-CH3.

2. **Understand the Oxidation Process**:
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