Consider the following compounds and select the incorrect statement from the following :
`NH_(3),PH_(3),H_(2)S, SO_(2), SO_(3), BF_(3), PCl_(3), IF_(7), P_(4), H_(2)`

Options

A. 3 molecules out of given compounds involve `Sp^(2)` hybridisation
B. Three molecules are hyprevalent compounds
C. Six molecules out of above compounds are non-planar in structure
D. Two molecules out of given compounds involves `(dpi-p pi)` bonding as well as also involves `(p pi-p pi)` bonding.

Answer

To solve the question, we need to analyze the given compounds and evaluate the statements provided. Let's go through each statement step by step.

### Step 1: Identify the Hybridization of Each Compound

1. **NH₃ (Ammonia)**:
- Structure: Pyramidal
- Hybridization: sp³

2. **PH₃ (Phosphine)**:
- Structure: Pyramidal
- Hybridization: No hybridization (p-orbital)

3. **H₂S (Hydrogen Sulfide)**:
- Structure: Bent
- Hybridization: No hybridization (p-orbital)

4. **SO₂ (Sulfur Dioxide)**:
- Structure: Bent
- Hybridization: sp²

5. **SO₃ (Sulfur Trioxide)**:
- Structure: Trigonal planar
- Hybridization: sp²

6. **BF₃ (Boron Trifluoride)**:
- Structure: Trigonal planar
- Hybridization: sp²

7. **PCl₃ (Phosphorus Trichloride)**:
- Structure: Pyramidal
- Hybridization: sp³

8. **IF₇ (Iodine Heptafluoride)**:
- Structure: Pentagonal bipyramidal
- Hybridization: sp³d³

9. **P₄ (White Phosphorus)**:
- Structure: Tetrahedral
- Hybridization: sp³

10. **H₂ (Hydrogen)**:
- Structure: Linear
- Hybridization: No hybridization (s-orbital)

### Step 2: Evaluate Each Statement

1. **Statement A**: "Three molecules out of the given compounds involve sp² hybridization."
- **Correct**: SO₂, SO₃, and BF₃ are sp² hybridized.

2. **Statement B**: "Three molecules are hypervalent compounds."
- **Correct**: SO₂, SO₃, and IF₇ are hypervalent.

3. **Statement C**: "Six molecules out of the above compounds are non-planar in nature."
- **Incorrect**:
- Non-planar compounds: NH₃, PH₃, PCl₃, IF₇, and P₄ (Total: 5)
- Planar compounds: H₂S, SO₂, SO₃, BF₃, H₂ (Total: 5)
- Therefore, only 5 compounds are non-planar.

4. **Statement D**: "Two molecules out of the given compounds involve d-pi-pi bonding as well as p-pi-pi bonding."
- **Correct**: SO₂ and SO₃ exhibit both types of bonding.

### Conclusion

The incorrect statement is **Statement C**, which claims that six molecules are non-planar. In reality, only five are non-planar.

### Final Answer
The incorrect statement is: **C. Six molecules out of the above compounds are non-planar in nature.**

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