Which compound has bond angle nearly to `90^@`

Options

A. `H_2O`
B. `H_2S`
C. `NH_3`
D. `CH_4`

Explanation

To determine which compound has a bond angle nearly equal to 90 degrees, we can analyze the molecular geometry and hybridization of various compounds.

### Step-by-Step Solution:

1. **Understanding Bond Angles**:
- Bond angles are influenced by the hybridization of the central atom and the presence of lone pairs.
- For example, in tetrahedral geometry (like in CH4), the bond angles are approximately 109.5 degrees.

2. **Analyzing Water (H2O)**:
- Water has a bent shape due to two lone pairs on oxygen, resulting in a bond angle of about 104.5 degrees.
- This is not close to 90 degrees.

3. **Analyzing Hydrogen Sulfide (H2S)**:
- H2S is a dragomolecule, meaning it does not undergo hybridization.
- The bond angle in H2S is approximately 92 degrees, which is close to 90 degrees.

4. **Analyzing Phosphine (PH3)**:
- Similar to H2S, PH3 is also a dragomolecule and does not show hybridization.
- The bond angle is around 93.5 degrees, which is also close to 90 degrees.

5. **Analyzing Ammonia (NH3)**:
- NH3 has a trigonal pyramidal shape due to one lone pair on nitrogen, resulting in a bond angle of about 107.5 degrees.
- This is not close to 90 degrees.

6. **Analyzing Methane (CH4)**:
- CH4 has a tetrahedral shape with bond angles of about 109.5 degrees.
- This is far from 90 degrees.

7. **Conclusion**:
- Among the compounds analyzed, both H2S and PH3 have bond angles that are nearly 90 degrees.
- Therefore, the correct answer to the question is that H2S (or PH3) has a bond angle nearly equal to 90 degrees.

### Final Answer:
The compound that has a bond angle nearly equal to 90 degrees is **H2S** (or **PH3**).