Which of the following is oxidised by `KMnO_4`

Options

A. Methane
B. Pentane
C. Isobutane
D. Neopentane

Explanation

To determine which of the following compounds is oxidized by KMnO4, we need to analyze each compound's structure and the nature of the oxidation reaction.

1. **Identify the Compounds**: The compounds given are alkenes, pentane, isobutane, and neopentane.

2. **Understand KMnO4 as an Oxidizing Agent**: KMnO4 (potassium permanganate) is a strong oxidizing agent. It typically oxidizes alkenes and certain other organic compounds.

3. **Analyze Each Compound**:
- **Alkenes**: Alkenes can be oxidized by KMnO4, especially if they have accessible double bonds. However, the degree of oxidation depends on the structure of the alkene.
- **Pentane**: Pentane is an alkane (C5H12) and does not have a double bond. Alkanes are generally resistant to oxidation by KMnO4.
- **Isobutane**: Isobutane (C4H10) is also an alkane and does not have a double bond. Therefore, it is not oxidized by KMnO4.
- **Neopentane**: Neopentane (C5H12) is another alkane with no double bonds, making it resistant to oxidation by KMnO4.

4. **Conclusion**: Among the given compounds, only alkenes can be oxidized by KMnO4. However, since the question does not specify a particular alkene, we conclude that the alkenes are the only candidates that can be oxidized by KMnO4.

**Final Answer**: Alkenes are oxidized by KMnO4.