Select the incorrect match:

Options

A. `Fe^(3+)+[Fe(CN)_(6)]^(4-) to `Blue colour ppt.
B. `Fe^(3+)[Fe(CN)_(6)]^(3-)to`Red brown colouration
C. `Fe^(2+)+[Fe(CN)_(6)]^(3-)to`Blue colour ppt.
D. `Fe^(2+)+[Fe(CN)_(6)]^(4-)to`Red brown colouration

Explanation

To solve the question of selecting the incorrect match regarding the reactions involving iron and ferrocyanide complexes, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Analyzing the First Option:**
- Reaction: \( \text{Fe}^{3+} + \text{Fe(CN)}_6^{4-} \)
- Product: Forms a blue color precipitate.
- Correct Match: The product formed is \( \text{Fe}_3[\text{Fe(CN)}_6] \) which is indeed a blue precipitate known as Turnbull's blue.
- **Conclusion:** This option is correct.

2. **Analyzing the Second Option:**
- Reaction: \( \text{Fe} + \text{Fe}^{3+} + \text{Fe(CN)}_6^{3-} \)
- Product: Forms a red-brown colored solution.
- Correct Match: The product formed is \( \text{Fe}_2[\text{Fe(CN)}_6] \), which gives a red-brown coloration.
- **Conclusion:** This option is also correct.

3. **Analyzing the Third Option:**
- Reaction: \( \text{Fe}^{2+} + \text{Fe(CN)}_6^{3-} \)
- Product: Forms a blue color precipitate.
- Correct Match: The product formed is \( \text{Fe}_3[\text{Fe(CN)}_6] \), which is a blue precipitate.
- **Conclusion:** This option is correct.

4. **Analyzing the Fourth Option:**
- Reaction: \( \text{Fe}^{2+} + \text{Fe(CN)}_6^{4-} \)
- Product: Claims to form a white precipitate.
- Correct Match: The actual product formed is \( \text{K}_2[\text{Fe}_2[\text{Fe(CN)}_6]] \), which is a white precipitate.
- **Conclusion:** However, it is stated to form a white precipitate, which is correct, but the context of the question is to identify the incorrect match. The confusion arises because the color may not be as straightforward as stated.

### Final Conclusion:
The incorrect match is **Option 4**, as it is misleading regarding the color of the precipitate formed.