Which of the following statements is/are true for `XeOF_4` molecule?

Options

A. It is planar.
B. It has a total of 15 lone pairs.
C. It hydrolyses to produce `XeO_3`
D. The shape is square pyramidal.

Answer

To determine which statements about the `XeOF4` molecule are true, we need to analyze its structure and properties step by step.

### Step 1: Draw the Lewis Structure of `XeOF4`
- Xenon (Xe) is the central atom, surrounded by one oxygen (O) and four fluorine (F) atoms.
- The oxygen atom forms a double bond with xenon, while each fluorine atom forms a single bond with xenon.
- After drawing the Lewis structure, we can see that the arrangement of the atoms leads to a specific geometry.

**Hint:** Remember that the central atom's valence electrons and the number of bonds formed will help you determine the overall structure.

### Step 2: Determine the Molecular Geometry
- The molecular geometry of `XeOF4` can be determined using the VSEPR theory.
- With one double bond (Xe=O) and four single bonds (Xe-F), the electron pair geometry is octahedral.
- However, since one of the positions is occupied by a double bond, the molecular shape is square pyramidal.

**Hint:** Use VSEPR theory to predict the shape based on the number of bonding pairs and lone pairs around the central atom.

### Step 3: Count the Lone Pairs
- In `XeOF4`, xenon has 8 valence electrons.
- It forms one double bond with oxygen (2 electrons) and four single bonds with fluorine (4 electrons).
- This accounts for 6 electrons used in bonding, leaving 2 electrons as a lone pair on xenon.
- Each fluorine atom contributes 3 lone pairs (3 F atoms = 9 lone pairs), and oxygen contributes 2 lone pairs.
- Total lone pairs = 2 (from Xe) + 9 (from 3 F) + 2 (from O) = 13 lone pairs.

**Hint:** Count the lone pairs carefully, considering both the central atom and surrounding atoms.

### Step 4: Analyze Hydrolysis
- When `XeOF4` reacts with water, it hydrolyzes to form `XeO2F2` and `HF`.
- It does not produce `XeO3` directly, so this statement is incorrect.

**Hint:** Check the products of hydrolysis reactions to confirm or deny the statements.

### Step 5: Evaluate Each Statement
1. **It is planar** - **False** (The shape is square pyramidal, which is non-planar).
2. **It has a total of 15 lone pairs** - **False** (It has 13 lone pairs).
3. **It hydrolyzes to produce `XeO3`** - **False** (It produces `XeO2F2` and `HF`).
4. **It is square pyramidal** - **True** (The geometry is indeed square pyramidal).

### Conclusion
Based on the analysis:
- The true statement about `XeOF4` is that it is square pyramidal.
- The other statements are false.

### Final Answers:
- True: Statement 4
- False: Statements 1, 2, and 3