Which among the followiing molecules is not perfect flat?

Options

A. `B_(3)N_(3)H_(6)`
B. `C_(3)N_(3)(NH_(2))_(3)`
C. `SO_(3)`
D. `C_(3)N_(3)(N_(3))_(3)`

Answer

To determine which among the given molecules is not perfectly flat, we will analyze the molecular structures of each option provided.

### Step-by-Step Solution:

1. **Identify the Molecules**: The options given are:
- A) B3N3H6
- B) C3N3NH2 (thrice)
- C) SO3
- D) C3N3N3 (thrice)

2. **Analyze Option A: B3N3H6**:
- Draw the structure of B3N3H6.
- The molecule consists of boron (B) and nitrogen (N) atoms with hydrogen (H) atoms attached.
- The arrangement of atoms shows that it is planar due to the trigonal planar geometry around boron and nitrogen atoms.
- **Conclusion**: This molecule is planar.

3. **Analyze Option B: C3N3NH2 (thrice)**:
- Draw the structure of C3N3NH2.
- The molecule consists of alternating carbon (C) and nitrogen (N) atoms with NH2 groups attached to the carbon atoms.
- The resonance structures indicate that this molecule is also planar due to the arrangement of alternating double bonds.
- **Conclusion**: This molecule is planar.

4. **Analyze Option C: SO3**:
- Draw the structure of SO3.
- The sulfur (S) atom is surrounded by three oxygen (O) atoms, forming a trigonal planar structure.
- All bond angles are equal, confirming that SO3 is a planar molecule.
- **Conclusion**: This molecule is planar.

5. **Analyze Option D: C3N3N3 (thrice)**:
- Draw the structure of C3N3N3.
- This molecule consists of carbon and nitrogen atoms with a complex arrangement involving resonance structures.
- The presence of charged nitrogen atoms (N3) introduces steric effects and electronic repulsion, leading to a non-planar configuration.
- **Conclusion**: This molecule is not planar.

6. **Final Answer**: The molecule that is not perfectly flat is option D: C3N3N3 (thrice).