Which of the following chlorides are soluble in pyridine ?

Options

A. LiCl
B. CsCl
C. NaCl
D. `BeCl_(2)`

Explanation

To determine which chlorides are soluble in pyridine, we need to consider the nature of the chlorides and the solvent properties of pyridine. Pyridine is a polar aprotic solvent, which means it can solvate cations but does not solvate anions as effectively as polar protic solvents.

Here’s a step-by-step solution:

### Step 1: Identify the Chlorides
First, we need to identify the chlorides in question. Common alkali metal chlorides include:
- Sodium chloride (NaCl)
- Potassium chloride (KCl)
- Lithium chloride (LiCl)
- Rubidium chloride (RbCl)
- Cesium chloride (CsCl)

### Step 2: Understand Solubility in Pyridine
Pyridine can dissolve certain metal chlorides due to its ability to stabilize cations. However, the solubility can vary based on the size and charge of the cation and the lattice energy of the chloride.

### Step 3: Analyze Each Chloride
- **LiCl**: Lithium chloride is known to be soluble in polar solvents, including pyridine, due to its small size and high charge density, which allows it to interact favorably with the solvent.
- **NaCl**: Sodium chloride is less soluble in pyridine compared to LiCl because of its larger ionic size and stronger lattice energy.
- **KCl**: Potassium chloride is also less soluble in pyridine for similar reasons as NaCl.
- **RbCl and CsCl**: These larger alkali metal chlorides are generally insoluble in pyridine due to their even larger ionic sizes and higher lattice energies.

### Step 4: Conclusion
From the analysis, we can conclude that:
- **LiCl** is soluble in pyridine.
- **NaCl**, **KCl**, **RbCl**, and **CsCl** are not soluble in pyridine.

### Final Answer
The chloride that is soluble in pyridine is **LiCl**.

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