Which of the following statements are not correct ?

Options

A. NaCl being an ionic compound is a good
conductor of elecricity in the solid state
B. In canonical structures , there is a difference in
the arrangement of atoms
C. Hybrid orbitals form stronger bonds than pure orbitals
D. VSEPR Theory can explain the square planar
geometry o f`XeF_(4)`.

Explanation

To determine which statements are not correct, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Analyze Statement 1**: "NaCl being an ionic compound is a good conductor of electricity in a solid state."
- **Explanation**: Sodium chloride (NaCl) is an ionic compound. In the solid state, the ions (Na⁺ and Cl⁻) are held together by strong electrostatic forces in a crystal lattice structure. This strong attraction prevents the ions from moving freely, which is necessary for electrical conductivity. Therefore, NaCl is not a good conductor of electricity in the solid state.
- **Conclusion**: This statement is **not correct**.

2. **Analyze Statement 2**: "Canonical structures show different arrangements of atoms."
- **Explanation**: Canonical structures (or resonance structures) represent different ways of drawing the same molecule, but they do not involve a change in the arrangement of atoms. Instead, they show the distribution of electrons. For example, in benzene, all the carbon atoms remain in the same position; only the placement of the double bonds changes. Thus, this statement is also **not correct**.

3. **Analyze Statement 3**: "Hybrid orbitals form stronger bonds than pure orbitals."
- **Explanation**: Hybridization involves the mixing of atomic orbitals to form new hybrid orbitals that can overlap more effectively with other orbitals, leading to stronger bonds. This is a correct statement as hybrid orbitals indeed form stronger bonds than pure atomic orbitals.
- **Conclusion**: This statement is **correct**.

4. **Analyze Statement 4**: "VSEPR theory can explain the square planar geometry of XeF4."
- **Explanation**: The Valence Shell Electron Pair Repulsion (VSEPR) theory does explain the geometry of molecules based on the repulsion between electron pairs. In the case of XeF4, there are two lone pairs and four bond pairs, leading to a square planar geometry. This statement is **correct**.

### Final Conclusion:
The statements that are **not correct** are:
- Statement 1: NaCl being an ionic compound is a good conductor of electricity in a solid state.
- Statement 2: Canonical structures show different arrangements of atoms.