Which is not correctly matched ?

Options

A. `XeO_3` : Trigonal bipyramidal
B. `CIF_3` : T-shape
C. `XeF_4`: Square planar
D. `XeF_2`: Linear shape

Answer

To determine which option is not correctly matched, we need to analyze the given compounds and their respective shapes, hybridizations, and geometries.

### Step-by-Step Solution:

1. **Analyze XCO3 (Xenon Carbonate)**:
- **Valence Electrons**:
- Xenon (Xe) has 8 valence electrons.
- Oxygen (O) has 6 valence electrons, and there are 3 oxygen atoms, contributing a total of 18 valence electrons.
- Total = 8 (Xe) + 18 (3 O) = 26 valence electrons.
- **Bonding**:
- Xenon forms double bonds with each oxygen atom.
- This results in 3 bond pairs (1 double bond = 1 bond pair).
- **Lone Pairs**:
- After forming bonds, there are 2 electrons left as lone pairs on the xenon atom.
- **Steric Number**:
- Steric number = Number of bond pairs + Number of lone pairs = 3 (bond pairs) + 1 (lone pair) = 4.
- **Hybridization**:
- Hybridization is sp³.
- **Geometry**:
- The geometry is tetrahedral, but due to the presence of a lone pair, the shape is trigonal pyramidal.
- **Conclusion**: The statement about XCO3 being trigonal bipyramidal is incorrect.

2. **Analyze ClF3 (Chlorine Trifluoride)**:
- **Valence Electrons**:
- Chlorine (Cl) has 7 valence electrons.
- Fluorine (F) has 7 valence electrons, and there are 3 fluorine atoms, contributing a total of 21 valence electrons.
- Total = 7 (Cl) + 21 (3 F) = 28 valence electrons.
- **Bonding**:
- Chlorine forms 3 bond pairs with fluorine.
- **Lone Pairs**:
- After forming bonds, there are 2 electrons left as lone pairs on the chlorine atom.
- **Steric Number**:
- Steric number = 3 (bond pairs) + 2 (lone pairs) = 5.
- **Hybridization**:
- Hybridization is sp³d.
- **Geometry**:
- The geometry is trigonal bipyramidal, but due to the presence of 2 lone pairs, the shape is T-shaped.
- **Conclusion**: The statement about ClF3 being T-shaped is correct.

3. **Final Conclusion**:
- The only incorrect match is for XCO3, which is stated to be trigonal bipyramidal, but it is actually trigonal pyramidal.

### Answer:
The option that is not correctly matched is **XCO3** (Xenon Carbonate) as it is incorrectly stated to have a trigonal bipyramidal shape.

---