Which of the following overlapping is not present in `XeO_(3)` molecule ?

Options

A. `sp^(3)+p_(x)`
B. `sp^(3)+p_(y)`
C. `d_(xz)+p_(x)`
D. `sp^(3)+s`

Answer

To determine which type of overlapping is not present in the `XeO3` molecule, we can follow these steps:

### Step 1: Understand the Structure of `XeO3`
- **Xenon (Xe)** is a noble gas with the electronic configuration of `Kr 4d10 5s2 5p6`. In the case of `XeO3`, xenon will undergo hybridization to form bonds with oxygen atoms.

### Step 2: Calculate the Total Valence Electrons
- **Valence electrons of Xenon**: 8
- **Valence electrons of Oxygen**: 6 (for each oxygen atom)
- Since there are 3 oxygen atoms: \(6 \times 3 = 18\)
- **Total valence electrons**: \(8 + 18 = 26\)

### Step 3: Determine the Hybridization
- To find the hybridization of xenon in `XeO3`, we need to calculate the number of bond pairs and lone pairs.
- **Bond pairs**: 3 (one for each oxygen)
- **Total electrons used in bonding**: 3 bond pairs (6 electrons)
- **Remaining electrons**: \(26 - 6 = 20\)
- **Lone pairs**: The remaining 20 electrons can be divided into lone pairs.
- Each lone pair consists of 2 electrons, so \(20 / 2 = 10\) lone pairs.
- However, we need to consider the geometry: `XeO3` has a pyramidal shape, which indicates that there is 1 lone pair and 3 bond pairs.

### Step 4: Identify the Types of Overlapping
- The hybridization of xenon in `XeO3` is `sp3` due to the presence of 3 bond pairs and 1 lone pair.
- The types of overlapping that can occur in `XeO3` include:
- **Sigma (σ) bonds**: Formed by the end-to-end overlap of orbitals.
- **Pi (π) bonds**: Formed by the sidewise overlap of p orbitals.

### Step 5: Analyze the Overlapping Types
- **sp3 with px**: This overlap is possible as the `sp3` hybridized orbitals can overlap with the `px` orbitals of oxygen.
- **sp3 with py**: This overlap is also possible.
- **dxz with px**: This overlap is possible as well, forming π bonds.
- **sp3 with s**: This overlap is **not present** because the `s` orbital of oxygen does not participate in bonding with the `sp3` hybridized orbital of xenon.

### Conclusion
The type of overlapping that is **not present** in the `XeO3` molecule is the **overlap between sp3 hybridized orbital and s orbital**.