Which one of the following compounds has bond angle close to `90^@` ?

Options

A. `PH_(3)`
B. `SF_(6)`
C. `H_(2)S`
D. All of these

Explanation

To determine which compound has a bond angle close to 90 degrees, we will analyze the molecular geometries of the given compounds one by one.

### Step 1: Analyze Option A - \( \text{PH}_3 \)
- **Structure**: Phosphorus (P) is the central atom with three hydrogen (H) atoms bonded to it and one lone pair of electrons.
- **Geometry**: The geometry of \( \text{PH}_3 \) is trigonal pyramidal due to the presence of the lone pair.
- **Bond Angle**: The bond angles are slightly less than 109.5 degrees (the ideal tetrahedral angle) due to the repulsion from the lone pair, but they are not close to 90 degrees.

**Hint**: Consider the effect of lone pairs on bond angles in trigonal pyramidal structures.

### Step 2: Analyze Option B - \( \text{SF}_6 \)
- **Structure**: Sulfur (S) is the central atom surrounded by six fluorine (F) atoms.
- **Geometry**: The geometry of \( \text{SF}_6 \) is octahedral.
- **Bond Angle**: The bond angles between the fluorine atoms are 90 degrees.

**Hint**: Recall that in an octahedral geometry, all adjacent bond angles are 90 degrees.

### Step 3: Analyze Option C - \( \text{H}_2\text{S} \)
- **Structure**: Sulfur (S) is the central atom with two hydrogen (H) atoms and two lone pairs of electrons.
- **Geometry**: The geometry of \( \text{H}_2\text{S} \) is bent (or V-shaped).
- **Bond Angle**: The bond angle is approximately 104.5 degrees, which is not close to 90 degrees.

**Hint**: Remember that lone pairs can distort bond angles from the ideal values.

### Step 4: Conclusion
After analyzing all the options, we find that:
- \( \text{PH}_3 \) has bond angles less than 109.5 degrees.
- \( \text{SF}_6 \) has bond angles of 90 degrees.
- \( \text{H}_2\text{S} \) has a bond angle of approximately 104.5 degrees.

Thus, the compound with a bond angle closest to 90 degrees is **Option B: \( \text{SF}_6 \)**.

### Final Answer
**The compound with a bond angle close to 90 degrees is \( \text{SF}_6 \).**