Which one is coloured ?

Options

A. `Cu_2Cl_2`
B. `[Sc(H_2O)_6]^(3+)`
C. `[Zn(H_2O)_6]^(2+)`
D. `[Ti(H_2O)_6]^(3+)`

Explanation

To determine which of the given compounds is colored, we need to analyze the electronic configurations of the central metal ions in each compound and check for the presence of unpaired electrons. Unpaired electrons are responsible for the color in transition metal complexes.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- Option A: Cu2Cl2
- Option B: Scandium H2O whole 6 plus 3
- Option C: Zinc H2O whole 6 plus 2
- Option D: Titanium H2O whole 6 plus 3

2. **Analyze Option A: Cu2Cl2**
- Determine the oxidation state of copper (Cu).
- Let the oxidation state of Cu be \( x \). The two Cl atoms contribute -2 (since Cl is -1).
- The equation becomes: \( 2x - 2 = 0 \) → \( x = +1 \).
- For Cu\(^+\), the electronic configuration is Argon 3d\(^{10}\).
- Since the 3d subshell is fully filled, there are no unpaired electrons.
- **Conclusion:** Cu2Cl2 is colorless.

3. **Analyze Option B: Scandium H2O whole 6 plus 3**
- The oxidation state of Scandium (Sc) is +3.
- The electronic configuration of Sc is Argon 3d\(^{1}\) 4s\(^{2}\).
- For Sc\(^3+\), it loses all three electrons, resulting in Argon (no electrons in the d or s subshell).
- **Conclusion:** Scandium H2O whole 6 plus 3 is colorless.

4. **Analyze Option C: Zinc H2O whole 6 plus 2**
- The oxidation state of Zinc (Zn) is +2.
- The electronic configuration of Zn is Argon 3d\(^{10}\) 4s\(^{2}\).
- For Zn\(^2+\), it loses the two 4s electrons, resulting in Argon 3d\(^{10}\).
- Since the 3d subshell is fully filled, there are no unpaired electrons.
- **Conclusion:** Zinc H2O whole 6 plus 2 is colorless.

5. **Analyze Option D: Titanium H2O whole 6 plus 3**
- The oxidation state of Titanium (Ti) is +3.
- The electronic configuration of Ti is Argon 3d\(^{2}\) 4s\(^{2}\).
- For Ti\(^3+\), it loses two 4s electrons and one 3d electron, resulting in Argon 3d\(^{1}\).
- There is one unpaired electron in the 3d subshell.
- **Conclusion:** Titanium H2O whole 6 plus 3 is colored.

6. **Final Answer:**
- The compound that is colored is **Option D: Titanium H2O whole 6 plus 3**.