Select pair of compounds in which both have different hybridization but have same molecular geometry :

Options

A. `BF_(3) , BrF_(3)`
B. `IC l_(2)^(Theta), BeCl_(2)`
C. `BCl_(3), PCl_(3)`
D. `PCl_(3), NCl_(3)`

Explanation

To solve the question of selecting a pair of compounds that have different hybridization but the same molecular geometry, we can follow these steps:

### Step 1: Understand the Concepts
We need to understand the concepts of hybridization and molecular geometry. Hybridization refers to the mixing of atomic orbitals to form new hybrid orbitals, while molecular geometry describes the three-dimensional arrangement of atoms in a molecule.

### Step 2: Identify the Compounds
We need to identify pairs of compounds and analyze their hybridization and geometry. We will look for pairs that have different hybridization but the same geometry.

### Step 3: Analyze the First Pair
Let's consider the first pair: **BrF3** and **BCl3**.
- **BrF3**: Bromine (Br) has 7 valence electrons. It forms 3 bonds with fluorine (F) and has 2 lone pairs. The steric number is 5 (3 bond pairs + 2 lone pairs). Therefore, the hybridization is **sp³d** and the geometry is **T-shaped**.
- **BCl3**: Boron (B) has 3 valence electrons and forms 3 bonds with chlorine (Cl). It has no lone pairs, giving it a steric number of 3. The hybridization is **sp²** and the geometry is **trigonal planar**.

These compounds do not satisfy our requirement since they have different geometries.

### Step 4: Analyze the Second Pair
Now, let's consider **BeCl2** and **ICl2⁻**.
- **BeCl2**: Beryllium (Be) has 2 valence electrons and forms 2 bonds with chlorine (Cl). It has no lone pairs, so the steric number is 2. The hybridization is **sp** and the geometry is **linear**.
- **ICl2⁻**: Iodine (I) has 7 valence electrons. In ICl2⁻, it forms 2 bonds with chlorine and has 3 lone pairs. The steric number is 5 (2 bond pairs + 3 lone pairs). The hybridization is **sp³d** and the geometry is also **linear**.

This pair has different hybridization but the same molecular geometry (linear).

### Step 5: Conclusion
The pair of compounds that have different hybridization but the same molecular geometry is **BeCl2** (sp hybridization, linear geometry) and **ICl2⁻** (sp³d hybridization, linear geometry).