Pick out the incorrect statement for `XeF_4`

Options

A. `XeF_4` disproportionates violently with water
B. It is used as fluorinating agent
C. It has octahedral shape
D. It oxidizes `I^(-)" or " I_2`

Answer

To determine the incorrect statement regarding `XeF4` (xenon tetrafluoride), we will analyze each statement provided in the question and verify its accuracy based on our understanding of the compound's properties and behavior.

### Step-by-Step Solution:

1. **Understanding Disproportionation Reaction:**
- **Statement:** Xenon tetrafluoride shows disproportionation reaction with water.
- **Analysis:** When `XeF4` reacts with water, it produces xenon trioxide (`XeO3`), hydrogen fluoride (`HF`), xenon in its zero oxidation state, and oxygen gas. The oxidation states of xenon change from +4 to +6 and +0, indicating that both oxidation and reduction are occurring. This confirms that the reaction is indeed a disproportionation reaction.
- **Conclusion:** This statement is **correct**.

2. **Fluorinating Agent:**
- **Statement:** Xenon tetrafluoride is a good fluorinating agent.
- **Analysis:** `XeF4` can act as a good fluorinating agent as it can donate fluoride ions in reactions with other compounds, such as antimony pentafluoride (`SbF5`). This property is well-documented in chemical literature.
- **Conclusion:** This statement is **correct**.

3. **Shape and Geometry:**
- **Statement:** The shape of `XeF4` is octahedral.
- **Analysis:** The hybridization of xenon in `XeF4` is `sp3d2`, which gives it an octahedral geometry. However, due to the presence of two lone pairs of electrons, the actual molecular shape is square planar. Therefore, while the geometry is octahedral, the shape is square planar.
- **Conclusion:** This statement is **incorrect**.

4. **Oxidizing Iodine:**
- **Statement:** `XeF4` oxidizes iodine.
- **Analysis:** In reactions with potassium iodide (`KI`), `XeF4` does indeed oxidize iodine from an oxidation state of -1 to 0, confirming its oxidizing properties.
- **Conclusion:** This statement is **correct**.

### Final Conclusion:
The incorrect statement regarding `XeF4` is that its shape is octahedral. The correct shape is square planar, while the geometry is octahedral.