Which is planar molecule ?

Options

A. `XeO_(4)`
B. `XeF_(4)`
C. `XeOF_(4)`
D. `XeO_(2)F_(2)`

Explanation

To determine which molecule is planar among the given options, we will analyze the structures of the compounds involving xenon (Xe) and their geometries based on their hybridization and the arrangement of their bonds and lone pairs.

### Step-by-Step Solution:

1. **Identify the Compounds**: The question involves several compounds of xenon (Xe), specifically XeO4, XeF4, XeOF4, and XeO2F2.

2. **Analyze XeO4**:
- **Valence Electrons**: Xenon has 8 valence electrons.
- **Structure**: In XeO4, xenon forms four sigma bonds with oxygen atoms.
- **Hybridization**: The hybridization is sp³, leading to a tetrahedral shape.
- **Planarity**: A tetrahedral shape is not planar.

3. **Analyze XeF4**:
- **Valence Electrons**: Xenon has 8 valence electrons.
- **Structure**: In XeF4, xenon forms four sigma bonds with fluorine atoms and has two lone pairs.
- **Hybridization**: The hybridization is sp³d², leading to an octahedral electron pair geometry.
- **Planarity**: The molecular shape is square planar due to the arrangement of the bonds and lone pairs, making it planar.

4. **Analyze XeOF4**:
- **Valence Electrons**: Xenon has 8 valence electrons.
- **Structure**: In XeOF4, xenon forms four sigma bonds (three with fluorine and one with oxygen) and has one lone pair.
- **Hybridization**: The hybridization is sp³d².
- **Planarity**: The molecular shape is square pyramidal, which is not planar.

5. **Analyze XeO2F2**:
- **Valence Electrons**: Xenon has 8 valence electrons.
- **Structure**: In XeO2F2, xenon forms two sigma bonds with fluorine and two double bonds with oxygen.
- **Hybridization**: The hybridization is sp³d.
- **Planarity**: The molecular shape is seesaw, which is also not planar.

6. **Conclusion**: Among the analyzed compounds, only **XeF4** has a square planar geometry, making it the only planar molecule.

### Final Answer:
The planar molecule is **XeF4**.