Which one of the following does not match with respect to the shape of the molecule?

Options

A. `NH_(3)-` Trigonal pyramidal
B. `SF_(4)-` Tetrahedral
C. `H_(2)S-`Tetrahedral
D. `XeF_(4)-` Square planar

Explanation

To determine which option does not match with respect to the shape of the molecule, we will analyze each option step by step, focusing on the central atom's steric number, hybridization, geometry, and shape.

### Step 1: Analyze NH3 (Ammonia)
1. **Central Atom**: Nitrogen (N)
2. **Valence Electrons**: Nitrogen has 5 valence electrons.
3. **Bonds**: NH3 has 3 N-H bonds (sigma bonds).
4. **Lone Pairs**: Nitrogen has 1 lone pair.
5. **Steric Number**: Steric number = number of sigma bonds + lone pairs = 3 + 1 = 4.
6. **Hybridization**: With a steric number of 4, the hybridization is sp³.
7. **Geometry**: The geometry is tetrahedral.
8. **Shape**: The shape is trigonal pyramidal due to the presence of the lone pair.

**Conclusion for NH3**: The shape is correctly identified as trigonal pyramidal.

### Step 2: Analyze SF4 (Sulfur Tetrafluoride)
1. **Central Atom**: Sulfur (S)
2. **Valence Electrons**: Sulfur has 6 valence electrons.
3. **Bonds**: SF4 has 4 S-F bonds (sigma bonds).
4. **Lone Pairs**: Sulfur has 1 lone pair.
5. **Steric Number**: Steric number = number of sigma bonds + lone pairs = 4 + 1 = 5.
6. **Hybridization**: With a steric number of 5, the hybridization is sp³d.
7. **Geometry**: The geometry is trigonal bipyramidal.
8. **Shape**: The shape is seesaw due to the lone pair occupying an equatorial position.

**Conclusion for SF4**: The shape is incorrectly matched as it is seesaw, not tetrahedral.

### Step 3: Analyze H2S (Hydrogen Sulfide)
1. **Central Atom**: Sulfur (S)
2. **Valence Electrons**: Sulfur has 6 valence electrons.
3. **Bonds**: H2S has 2 S-H bonds (sigma bonds).
4. **Lone Pairs**: Sulfur has 2 lone pairs.
5. **Steric Number**: Steric number = number of sigma bonds + lone pairs = 2 + 2 = 4.
6. **Hybridization**: With a steric number of 4, the hybridization is sp³.
7. **Geometry**: The geometry is tetrahedral.
8. **Shape**: The shape is bent or V-shaped due to the presence of lone pairs.

**Conclusion for H2S**: The shape is incorrectly matched as it is bent, not tetrahedral.

### Step 4: Analyze XeF4 (Xenon Tetrafluoride)
1. **Central Atom**: Xenon (Xe)
2. **Valence Electrons**: Xenon has 8 valence electrons.
3. **Bonds**: XeF4 has 4 Xe-F bonds (sigma bonds).
4. **Lone Pairs**: Xenon has 2 lone pairs.
5. **Steric Number**: Steric number = number of sigma bonds + lone pairs = 4 + 2 = 6.
6. **Hybridization**: With a steric number of 6, the hybridization is sp³d².
7. **Geometry**: The geometry is octahedral.
8. **Shape**: The shape is square planar, as the lone pairs are positioned opposite each other.

**Conclusion for XeF4**: The shape is correctly identified as square planar.

### Final Conclusion
- **Option 1 (NH3)**: Correctly matched as trigonal pyramidal.
- **Option 2 (SF4)**: Incorrectly matched; should be seesaw.
- **Option 3 (H2S)**: Incorrectly matched; should be bent.
- **Option 4 (XeF4)**: Correctly matched as square planar.

**Answer**: The options that do not match are **Option 2 (SF4)** and **Option 3 (H2S)**.