The molecule exhibiting maximum number of non-bonding electron pairs (l.p.) around the central atom is :

Options

A. `XeOF_(4)`
B. `XeO_(2)F_(2)`
C. `XeF_(3)^(-)`
D. `XeO_(3)`

Answer

To find the molecule exhibiting the maximum number of non-bonding electron pairs (lone pairs) around the central atom, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Molecules**: We will analyze the following molecules:
- XeOF4
- XeO2F2
- Fe3-
- XeO3

2. **Calculate Total Valence Electrons**: For each molecule, we will calculate the total number of valence electrons by adding the valence electrons of each atom present in the molecule.

- **For XeOF4**:
- Xe: 8 electrons
- O: 6 electrons
- F: 7 electrons × 4 = 28 electrons
- Total = 8 + 6 + 28 = 42 electrons

- **For XeO2F2**:
- Xe: 8 electrons
- O: 6 electrons × 2 = 12 electrons
- F: 7 electrons × 2 = 14 electrons
- Total = 8 + 12 + 14 = 34 electrons

- **For Fe3-**:
- Fe: 7 electrons × 3 = 21 electrons (since there are 3 Fe atoms)
- Additional electron for the -3 charge = 1 electron
- Total = 21 + 1 = 22 electrons

- **For XeO3**:
- Xe: 8 electrons
- O: 6 electrons × 3 = 18 electrons
- Total = 8 + 18 = 26 electrons

3. **Calculate Bond Pairs and Lone Pairs**: Using the formula:
- Number of bond pairs = Total valence electrons / 8
- Remainder = Total valence electrons % 8
- Number of lone pairs = Remainder / 2

- **For XeOF4**:
- Bond pairs = 42 / 8 = 5 (5 bond pairs)
- Remainder = 42 % 8 = 2
- Lone pairs = 2 / 2 = 1 lone pair

- **For XeO2F2**:
- Bond pairs = 34 / 8 = 4 (4 bond pairs)
- Remainder = 34 % 8 = 2
- Lone pairs = 2 / 2 = 1 lone pair

- **For Fe3-**:
- Bond pairs = 22 / 8 = 2 (2 bond pairs)
- Remainder = 22 % 8 = 6
- Lone pairs = 6 / 2 = 3 lone pairs

- **For XeO3**:
- Bond pairs = 26 / 8 = 3 (3 bond pairs)
- Remainder = 26 % 8 = 2
- Lone pairs = 2 / 2 = 1 lone pair

4. **Compare the Number of Lone Pairs**:
- XeOF4: 1 lone pair
- XeO2F2: 1 lone pair
- Fe3-: 3 lone pairs
- XeO3: 1 lone pair

5. **Conclusion**: The molecule with the maximum number of non-bonding electron pairs (lone pairs) around the central atom is **Fe3-**, which has **3 lone pairs**.

### Final Answer:
The molecule exhibiting the maximum number of non-bonding electron pairs (lone pairs) around the central atom is **Fe3-**.

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