Chlorides of which metal are soluble in organic solvents:

Options

A. `Mg`
B. `Ca`
C. `K`
D. `Be`

Answer

To determine which metal chlorides are soluble in organic solvents, we need to analyze the properties of the chlorides of various metals.

### Step-by-Step Solution:

1. **Identify the Metal Chlorides**:
We will consider the chlorides of the following metals:
- Magnesium (MgCl2)
- Calcium (CaCl2)
- Potassium (KCl)
- Beryllium (BeCl2)

2. **Understand the Nature of the Compounds**:
Most metal chlorides are ionic in nature. However, the solubility of these chlorides in organic solvents depends on their covalent character.

3. **Apply Fajans' Rule**:
Fajans' rule states that the covalent character of an ionic compound increases with:
- Higher charge on the cation
- Smaller size of the cation

4. **Analyze Each Metal Chloride**:
- **MgCl2**: Magnesium has a +2 charge and a relatively small size, but it is still predominantly ionic.
- **CaCl2**: Calcium also has a +2 charge but is larger than magnesium, leading to less covalent character.
- **KCl**: Potassium has a +1 charge and a larger size, resulting in low covalent character.
- **BeCl2**: Beryllium has a +2 charge and is the smallest among the alkaline earth metals, which gives it a significant covalent character.

5. **Determine Solubility in Organic Solvents**:
Since organic solvents tend to dissolve covalent compounds, we look for the chloride with the highest covalent character. Beryllium chloride (BeCl2) is primarily covalent due to its small size and high charge, making it soluble in organic solvents.

6. **Conclusion**:
Based on the analysis, the chloride that is soluble in organic solvents is **Beryllium Chloride (BeCl2)**.

### Final Answer:
The chlorides of **Beryllium (BeCl2)** are soluble in organic solvents.