Which of the following aromatic compounds will react with `KMnO_(4)` ?

Options

A.
B.
C.
D.

Explanation

To determine which aromatic compounds will react with KMnO4, we need to analyze the presence of alpha hydrogens in each compound. KMnO4 is a strong oxidizing agent that requires at least one alpha hydrogen for the reaction to occur. The reaction typically converts alkylbenzenes into carboxylic acids.

### Step-by-Step Solution:

1. **Identify the Compounds**:
Let's denote the aromatic compounds as A, B, C, and D.

2. **Understand the Role of Alpha Hydrogen**:
- Alpha hydrogens are the hydrogens attached to the carbon adjacent to the aromatic ring.
- For KMnO4 to react, there must be at least one alpha hydrogen present.

3. **Analyze Each Compound**:
- **Compound A**:
- Contains two alpha hydrogens.
- Since it has alpha hydrogens, it will react with KMnO4.
- **Compound B**:
- Contains three alpha hydrogens.
- This compound will also react with KMnO4 due to the presence of alpha hydrogens.
- **Compound C**:
- Contains one alpha hydrogen.
- Despite having two methyl groups, it still has one alpha hydrogen, so it will react with KMnO4.
- **Compound D**:
- Contains a tertiary butyl group with no alpha hydrogens.
- Since there are no alpha hydrogens, this compound will not react with KMnO4.

4. **Conclusion**:
- The compounds that will react with KMnO4 are A, B, and C.
- The compound that will not react is D.

### Final Answer:
- **Compounds that will react with KMnO4**: A, B, C
- **Compound that will not react**: D