which of the following is not the correct matches according to VESPER theory

Options

A. ICl_2 Linear ion
B. `ICl_4^-` Sqare plannee ion
C. `IF_5` sea -saw
D. `SO_2 ` Bent

Answer

To determine which of the following matches is not correct according to VSEPR (Valence Shell Electron Pair Repulsion) theory, we will analyze the given compounds one by one based on their electron configurations, hybridization, geometry, and shape.

### Step-by-Step Solution:

1. **Analyzing ICl2-**:
- **Valence Electrons**: Iodine (I) is in group 17 and has 7 valence electrons. The negative charge (-1) indicates it has gained one additional electron, giving it a total of 8 valence electrons.
- **Bond Pairs and Lone Pairs**: In ICl2-, there are 2 bond pairs (from the two I-Cl bonds) and 3 lone pairs (remaining electrons).
- **Steric Number**: The steric number is the sum of bond pairs and lone pairs: 2 (bond pairs) + 3 (lone pairs) = 5.
- **Hybridization**: The hybridization is sp³d.
- **Geometry**: The geometry is trigonal bipyramidal, and due to the presence of lone pairs, the shape is linear. This match is correct.

2. **Analyzing ICl4-**:
- **Valence Electrons**: Iodine has 7 valence electrons + 1 (from the negative charge) = 8 valence electrons.
- **Bond Pairs and Lone Pairs**: In ICl4-, there are 4 bond pairs and 2 lone pairs.
- **Steric Number**: 4 (bond pairs) + 2 (lone pairs) = 6.
- **Hybridization**: The hybridization is sp³d².
- **Geometry**: The geometry is octahedral, and the shape is square planar. This match is correct.

3. **Analyzing IF5**:
- **Valence Electrons**: Iodine has 7 valence electrons.
- **Bond Pairs and Lone Pairs**: In IF5, there are 5 bond pairs and 1 lone pair.
- **Steric Number**: 5 (bond pairs) + 1 (lone pair) = 6.
- **Hybridization**: The hybridization is sp³d².
- **Geometry**: The geometry is octahedral, and the shape is square pyramidal. This match is correct.

4. **Analyzing SO2**:
- **Valence Electrons**: Sulfur (S) has 6 valence electrons.
- **Bond Pairs and Lone Pairs**: In SO2, there are 2 bond pairs and 1 lone pair.
- **Steric Number**: 2 (bond pairs) + 1 (lone pair) = 3.
- **Hybridization**: The hybridization is sp².
- **Geometry**: The geometry is trigonal planar, and the shape is bent. This match is correct.

### Conclusion:
After analyzing all the compounds, the incorrect match is for IF5, which is stated to be square pyramidal in shape. The correct shape is actually square pyramidal, but the context suggests that there might have been a misrepresentation in the options provided.

Thus, the answer is **C** (IF5 is not square pyramidal).