In which of the following molecules, the number of possible `angleXAX` angles is maximum in the anionic part of their solid state ? [A : Central atom , X : Surrounding atom ]

Options

A. `PBr_5`
B. `N_2O_5`
C. `PCl_5`
D. `Cl_2O_6`

Answer

To solve the question regarding which molecule has the maximum number of possible `angleXAX` angles in the anionic part of their solid state, we will analyze the given compounds based on their hybridization and geometry.

### Step-by-Step Solution:

1. **Identify the Compounds**: The question involves analyzing the following compounds:
- PBr4
- N2O5
- PCl5
- Cl2O6

2. **Determine the Hybridization and Geometry**:
- **PBr4**: The hybridization is sp³ (tetrahedral geometry). In tetrahedral geometry, there are 4 bond angles (approximately 109.5°).
- **N2O5**: This compound can break down into NO3⁻, which has a trigonal planar structure (sp² hybridization). In this case, there are 3 bond angles (120°).
- **PCl5**: The hybridization is sp³d (trigonal bipyramidal geometry). This geometry has 5 bond angles (90° and 120°).
- **Cl2O6**: This compound can break down into ClO4⁻, which has a tetrahedral structure (sp³ hybridization). This results in 4 bond angles (approximately 109.5°).

3. **Analyze the Anionic Forms**:
- For **PBr4**, the anionic part does not exist as it is a neutral molecule.
- For **N2O5**, the relevant anion is NO3⁻, which has 3 angles.
- For **PCl5**, the relevant anion is PCl6⁻, which has 6 angles (90° and 180°).
- For **Cl2O6**, the relevant anion is ClO4⁻, which has 4 angles.

4. **Count the Angles**:
- PBr4: 0 angles (no anion)
- N2O5 (NO3⁻): 3 angles
- PCl5 (PCl6⁻): 6 angles
- Cl2O6 (ClO4⁻): 4 angles

5. **Conclusion**: The molecule with the maximum number of possible `angleXAX` angles in the anionic part is **PCl5**, which corresponds to the anion PCl6⁻ with 6 angles.

### Final Answer:
The correct answer is **PCl5**.