Assertion : Geometry of `IC l_(3)` is tetrahedral.
Reason : Its shape is T-shape, due to the presence of two lone pairs.

Options

A. If assertion is true but the reason is false
B. If assertion is false but reason is true
C. IF both assertion and reason are true and the reason is the correct explanation of assertion
D. If both assertion and reason are true but reason is not the correct explanation of assertion

Answer

To solve the question regarding the assertion and reason provided, we will analyze both statements step by step.

### Step 1: Understand the Assertion
The assertion states that the geometry of ICl3 is tetrahedral.

**Analysis**:
- ICl3, or iodine trichloride, consists of one iodine atom and three chlorine atoms.
- Iodine is in group 17 (halogens) and has 7 valence electrons.
- When iodine forms ICl3, it shares one electron with each of the three chlorine atoms, resulting in three bonding pairs of electrons.

### Step 2: Determine the Steric Number
The steric number is calculated by adding the number of bonded atoms to the number of lone pairs on the central atom (iodine in this case).

**Calculation**:
- Iodine has 3 bonding pairs (from the three I-Cl bonds).
- Iodine also has 2 lone pairs of electrons.
- Therefore, the steric number = 3 (bonding pairs) + 2 (lone pairs) = 5.

### Step 3: Identify the Hybridization
The hybridization can be determined from the steric number.

**Conclusion**:
- A steric number of 5 corresponds to sp³d hybridization.

### Step 4: Determine the Molecular Geometry
The molecular geometry is influenced by the arrangement of the bonding pairs and lone pairs.

**Analysis**:
- With 3 bonding pairs and 2 lone pairs, the arrangement of the electron pairs is trigonal bipyramidal.
- However, the presence of lone pairs affects the shape. The actual shape of ICl3 is T-shaped due to the repulsion caused by the lone pairs.

### Step 5: Evaluate the Reason
The reason states that the shape of ICl3 is T-shaped due to the presence of two lone pairs.

**Conclusion**:
- This statement is correct. The presence of the two lone pairs results in a T-shaped molecular geometry.

### Final Evaluation
- The assertion is false because the geometry of ICl3 is not tetrahedral; it is trigonal bipyramidal.
- The reason is true as the shape is indeed T-shaped due to the presence of two lone pairs.

### Final Answer
The correct answer is that the assertion is false and the reason is true.