Which of the following compound has highest covalent character

Options

A. `LiCl`
B. `LiBr`
C. `LiF`
D. `LiI`

Answer

To determine which of the given compounds has the highest covalent character, we can follow these steps:

### Step 1: Understand the Concept of Covalent Character
Covalent character in ionic compounds is influenced by the size of the ions involved. Generally, larger anions contribute to a greater covalent character in the compound.

### Step 2: Identify the Compounds
The compounds given are:
1. Lithium Chloride (LiCl)
2. Lithium Bromide (LiBr)
3. Lithium Fluoride (LiF)
4. Lithium Iodide (LiI)

### Step 3: Analyze the Anions
The anions in these compounds are:
- Chloride ion (Cl⁻)
- Bromide ion (Br⁻)
- Fluoride ion (F⁻)
- Iodide ion (I⁻)

### Step 4: Compare the Sizes of the Anions
The size of the anions increases as follows:
- F⁻ < Cl⁻ < Br⁻ < I⁻

Since the iodide ion (I⁻) is the largest among these anions, it will have the highest covalent character.

### Step 5: Consider the Cation
The cation in all these compounds is the same (Li⁺), which means we only need to focus on the anions for determining covalent character.

### Step 6: Conclusion
Since the iodide ion is the largest, Lithium Iodide (LiI) will have the highest covalent character among the given compounds.

### Final Answer
**Lithium Iodide (LiI) has the highest covalent character.**

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