State whether the statement is true or false.Among alkali metal halides LiI has highest covalent character.

Answer

To determine whether the statement "Among alkali metal halides, LiI has the highest covalent character" is true or false, we can analyze the properties of lithium iodide (LiI) in the context of covalent character.

### Step-by-Step Solution:

1. **Understanding Covalent Character**:
- Covalent character in ionic compounds is influenced by the size and charge of the ions involved. Smaller cations and larger anions tend to exhibit more covalent character.

2. **Identify the Alkali Metals**:
- The alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). Among these, lithium is the smallest in size.

3. **Identify the Halides**:
- The halides corresponding to these alkali metals are fluoride (F), chloride (Cl), bromide (Br), and iodide (I). Iodide (I) is the largest anion among these halides.

4. **Applying Fajans' Rules**:
- According to Fajans' rules, covalent character increases when:
- The cation is small and has a high positive charge.
- The anion is large and has a high negative charge.
- In LiI, lithium is the smallest cation and iodide is the largest anion among the alkali metal halides.

5. **Conclusion**:
- Since Li is the smallest cation and I is the largest anion, LiI satisfies the conditions for having the highest covalent character among alkali metal halides. Therefore, the statement is **True**.

### Final Answer:
The statement "Among alkali metal halides, LiI has the highest covalent character" is **True**.