Neutral ` FeCl_(3)` gives purple colour with

Options

A. Only phenol
B. p-cresol
C. 2,4,6-tribromophenol
D. All of these

Answer

To solve the question regarding which compound gives a purple color with neutral FeCl₃, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding FeCl₃**:
- FeCl₃ (iron(III) chloride) dissociates in solution to form Fe³⁺ ions and Cl⁻ ions. The Fe³⁺ ions are responsible for forming complexes with certain organic compounds.

**Hint**: Remember that FeCl₃ breaks down into Fe³⁺ and Cl⁻ ions when dissolved in water.

2. **Identifying the Phenoxide Ion**:
- Phenols can lose a hydrogen ion (H⁺) to form a phenoxide ion (C₆H₅O⁻). This ion can then react with Fe³⁺ to form a colored complex.

**Hint**: Look for compounds that can release a phenoxide ion when they react with a base or in solution.

3. **Reaction of Phenol with FeCl₃**:
- When phenol (C₆H₅OH) reacts with FeCl₃, it forms a phenoxide ion (C₆H₅O⁻) and a purple complex with Fe³⁺:
\[ \text{C₆H₅OH} \rightarrow \text{C₆H₅O}⁻ + \text{H}⁺ \]
\[ \text{Fe}^{3+} + \text{C₆H₅O}⁻ \rightarrow \text{Fe(C₆H₅O)₃} \quad \text{(purple complex)} \]

**Hint**: Identify the specific reaction that leads to the formation of the purple complex.

4. **Analyzing the Given Compounds**:
- Check each compound to see if it can produce a phenoxide ion. For example:
- **Phenol (C₆H₅OH)**: Can form phenoxide ion.
- **2,4,6-Tribromophenol**: Still retains the phenolic structure and can also form a phenoxide ion.
- **Any other compound**: Must be evaluated similarly.

**Hint**: Look for the presence of the hydroxyl (-OH) group in the compounds, as it indicates the potential to form a phenoxide ion.

5. **Conclusion**:
- Since all the compounds mentioned can produce a phenoxide ion, they will all react with FeCl₃ to form the purple complex.

**Final Answer**: All of the given compounds will give a purple color with neutral FeCl₃.

### Summary:
- The compounds that can form phenoxide ions will react with Fe³⁺ from FeCl₃ to produce a purple complex. Therefore, the answer is that all of the mentioned compounds will give a purple color with neutral FeCl₃.