Choose the correct statement regarding `SeOCl_(2)` molecule :

Options

A. It does not contain plane of symmtry
B. Cl-S-Cl` bond angle is greater than 'Cl-Se-O' bond angle
C. Lone pair has greater than 33.% s-character
D. Central atom used one d-ordital in bonding

Answer

To solve the question regarding the `SeOCl_(2)` molecule, we will analyze the structure and properties of the molecule step by step.

### Step-by-Step Solution:

1. **Determine the Valence Electrons:**
- Selenium (Se) is in Group 16 and has 6 valence electrons.
- Each chlorine (Cl) atom has 7 valence electrons, and there are two Cl atoms contributing a total of 14 valence electrons.
- Oxygen (O) is also in Group 16 and has 6 valence electrons.
- Total valence electrons = 6 (Se) + 6 (O) + 14 (2 Cl) = 26 valence electrons.

**Hint:** Count the valence electrons for each atom in the molecule to get the total.

2. **Draw the Lewis Structure:**
- Place Se as the central atom, bonded to one O atom with a double bond and two Cl atoms with single bonds.
- The structure can be represented as:
```
Cl
|
Se = O
|
Cl
```
- Ensure that all atoms have a complete octet where applicable.

**Hint:** Use double bonds for atoms that can accommodate more electrons (like O) and single bonds for others.

3. **Identify Hybridization:**
- The steric number for Se in `SeOCl_(2)` is 4 (1 double bond with O and 2 single bonds with Cl).
- The hybridization of Se is `sp^3` because it has 4 regions of electron density.

**Hint:** The steric number helps determine the hybridization of the central atom.

4. **Analyze Bond Angles:**
- In `sp^3` hybridization, the ideal bond angles are approximately 109.5 degrees.
- However, due to the presence of a double bond with O, the Cl-Se-Cl bond angle will be less than the Cl-Se-O bond angle because the double bond has greater repulsion.

**Hint:** Consider the effects of lone pairs and double bonds on bond angles.

5. **Evaluate the Statements:**
- **Statement 1:** The molecule does not have a plane of symmetry. (Incorrect)
- **Statement 2:** Cl-Se-Cl bond angle is greater than Cl-Se-O bond angle. (Incorrect)
- **Statement 3:** Lone pair has greater than 33.3% s character. (Incorrect)
- **Statement 4:** The central atom uses 1 d orbital in bonding. (Correct)

**Hint:** Assess each statement based on the molecular geometry and hybridization.

### Conclusion:
The correct statement regarding the `SeOCl_(2)` molecule is that the central atom uses 1 d orbital in bonding.