Which is not correctly matched ?

Options

A. `XeO_(3)` -Trigonal bipyramidal
B. `ClF_(3)`- bent T-shape
C. `XeOF_(4)`- Square pyramidal
D. `XeF_(2)`- Linear shape

Answer

To determine which option is not correctly matched, we will analyze the molecular shapes of the given compounds using the concept of steric number and hybridization.

### Step-by-Step Solution:

1. **Identify the Central Atom and Valence Electrons**:
- For each compound, identify the central atom and count its valence electrons.

2. **Calculate the Steric Number**:
- Use the formula:
\[ \text{Steric Number} = \frac{1}{2} \left( V + M + C \right) \]
where \( V \) is the number of valence electrons of the central atom, \( M \) is the number of monovalent atoms attached, and \( C \) is the charge (add if anion, subtract if cation).

3. **Determine Hybridization**:
- Based on the steric number, determine the hybridization:
- Steric number 2: sp
- Steric number 3: sp²
- Steric number 4: sp³
- Steric number 5: sp³d
- Steric number 6: sp³d²

4. **Analyze Each Compound**:
- **XeO3**:
- Central atom: Xenon (8 valence electrons)
- Oxygen is not monovalent, so \( M = 0 \).
- No charge: \( C = 0 \).
- Steric Number: \( \frac{1}{2}(8 + 0 + 0) = 4 \) → Hybridization: sp³
- Structure: Pyramidal (due to one lone pair).
- **Incorrectly matched as trigonal bipyramidal**.

- **ClF3**:
- Central atom: Chlorine (7 valence electrons)
- Three fluorine atoms attached: \( M = 3 \).
- No charge: \( C = 0 \).
- Steric Number: \( \frac{1}{2}(7 + 3 + 0) = 5 \) → Hybridization: sp³d
- Structure: Bent T-shaped (due to two lone pairs).
- **Correctly matched**.

- **XeOF4**:
- Central atom: Xenon (8 valence electrons)
- Four fluorine atoms attached: \( M = 4 \).
- No charge: \( C = 0 \).
- Steric Number: \( \frac{1}{2}(8 + 4 + 0) = 6 \) → Hybridization: sp³d²
- Structure: Square pyramidal (due to one lone pair).
- **Correctly matched**.

- **XeF2**:
- Central atom: Xenon (8 valence electrons)
- Two fluorine atoms attached: \( M = 2 \).
- No charge: \( C = 0 \).
- Steric Number: \( \frac{1}{2}(8 + 2 + 0) = 5 \) → Hybridization: sp³d
- Structure: Linear (due to three lone pairs).
- **Correctly matched**.

5. **Conclusion**:
- The only incorrect match is for **XeO3**, which is pyramidal but is incorrectly stated as trigonal bipyramidal.

### Final Answer:
The option that is not correctly matched is **XeO3** (it is pyramidal, not trigonal bipyramidal).

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