Phenol gives characteristic colouration with

Options

A. Iodine solution
B. Bromine water
C. Neutral `FeCl_3` solution
D. Ammonium hydroxide

Answer

### Step-by-Step Solution:

1. **Identify the Reactants**: The question asks about the characteristic coloration of phenol. The key reactant here is phenol (C6H5OH).

2. **Introduce the Reagent**: The reagent that gives a characteristic coloration with phenol is Ferric Chloride (FeCl3).

3. **Reaction Mechanism**: When phenol is mixed with FeCl3, a coordination complex is formed. The phenol donates a pair of electrons to the iron ion (Fe³⁺) in FeCl3, resulting in the formation of a complex.

4. **Formation of the Complex**: The reaction can be represented as:
\[ 6 \text{C}_6\text{H}_5\text{OH} + \text{FeCl}_3 \rightarrow \text{[Fe(C}_6\text{H}_5\text{O)}_6]^{3+} + 3 \text{HCl} \]
This complex is a coordination compound.

5. **Observation of Color**: The coordination compound formed has a characteristic violet color. This is a distinctive feature that helps in identifying phenol in analytical chemistry.

6. **Conclusion**: Therefore, the characteristic coloration observed when phenol reacts with FeCl3 is violet.

### Final Answer:
Phenol gives a characteristic violet coloration when reacted with Ferric Chloride (FeCl3).

---