Which of the following compound or ion is planar?

Options

A. `SF_(5)^(-)`
B. `SF_(4)`
C. `SOF_(4)`
D. `SF_(2)`

Explanation

To determine which of the given compounds or ions is planar, we need to analyze the molecular geometry and hybridization of each compound. The compounds we are considering are SF5-, SF4, SOF4, and SF2.

### Step-by-Step Solution:

1. **Identify the Valence Electrons:**
- Sulfur (S) has 6 valence electrons.
- Each Fluorine (F) has 7 valence electrons, but it contributes 1 electron when forming a bond.

2. **Analyze SF5-:**
- SF5- has 1 extra electron due to the negative charge, giving sulfur a total of 7 valence electrons.
- It forms 5 bonds with fluorine (using 5 of its electrons) and has 1 lone pair.
- **Steric Number:** 6 (5 bond pairs + 1 lone pair).
- **Hybridization:** sp³d².
- **Geometry:** Octahedral.
- **Shape:** Square pyramidal (due to the lone pair).
- **Conclusion:** Not planar.

3. **Analyze SF4:**
- SF4 has 6 valence electrons from sulfur and forms 4 bonds with fluorine.
- **Steric Number:** 5 (4 bond pairs + 1 lone pair).
- **Hybridization:** sp³d.
- **Geometry:** Trigonal bipyramidal.
- **Shape:** Seesaw (due to the lone pair).
- **Conclusion:** Not planar.

4. **Analyze SOF4:**
- SOF4 has 6 valence electrons from sulfur, 4 from fluorine (1 each), and 2 from oxygen (double bond).
- **Steric Number:** 5 (4 bond pairs + 0 lone pairs).
- **Hybridization:** sp³d.
- **Geometry:** Trigonal bipyramidal.
- **Shape:** Trigonal bipyramidal.
- **Conclusion:** Not planar.

5. **Analyze SF2:**
- SF2 has 6 valence electrons from sulfur and forms 2 bonds with fluorine.
- **Steric Number:** 4 (2 bond pairs + 2 lone pairs).
- **Hybridization:** sp³.
- **Geometry:** Tetrahedral.
- **Shape:** Bent (due to the lone pairs).
- **Conclusion:** Not planar.

### Final Conclusion:
None of the compounds SF5-, SF4, SOF4, or SF2 are planar. However, if we were to consider only the molecular geometry without lone pairs, SOF4 has a geometry that could be considered planar in a simplified view, but it is not strictly planar due to the three-dimensional arrangement of atoms.