Which of the following is an example of super octet molecule ?

Options

A. `ClF_(3)`
B. `PCl_(5)`
C. `IF_(7)`
D. All the three

Answer

To determine which of the given molecules is an example of a super octet molecule, we need to analyze each option based on the number of electrons surrounding the central atom. A super octet molecule is defined as one that has more than 8 electrons around its central atom. Let's evaluate each option step by step.

### Step 1: Analyze ClF3
1. **Identify the central atom**: In ClF3, chlorine (Cl) is the central atom.
2. **Count valence electrons**: Chlorine has 7 valence electrons.
3. **Draw the Lewis structure**: Chlorine is bonded to 3 fluorine atoms. Each fluorine atom contributes 1 shared electron.
4. **Count shared electrons**:
- Shared electrons from 3 fluorine atoms = 3.
5. **Total electrons around Cl**:
- Valence electrons (7) + Shared electrons (3) = 10 electrons.
6. **Conclusion**: ClF3 has more than 8 electrons around the central atom, making it a super octet molecule.

### Step 2: Analyze PCl5
1. **Identify the central atom**: In PCl5, phosphorus (P) is the central atom.
2. **Count valence electrons**: Phosphorus has 5 valence electrons.
3. **Draw the Lewis structure**: Phosphorus is bonded to 5 chlorine atoms.
4. **Count shared electrons**:
- Shared electrons from 5 chlorine atoms = 5.
5. **Total electrons around P**:
- Valence electrons (5) + Shared electrons (5) = 10 electrons.
6. **Conclusion**: PCl5 also has more than 8 electrons around the central atom, making it a super octet molecule.

### Step 3: Analyze IF7
1. **Identify the central atom**: In IF7, iodine (I) is the central atom.
2. **Count valence electrons**: Iodine has 7 valence electrons.
3. **Draw the Lewis structure**: Iodine is bonded to 7 fluorine atoms.
4. **Count shared electrons**:
- Shared electrons from 7 fluorine atoms = 7.
5. **Total electrons around I**:
- Valence electrons (7) + Shared electrons (7) = 14 electrons.
6. **Conclusion**: IF7 has more than 8 electrons around the central atom, making it a super octet molecule.

### Final Conclusion
All three molecules (ClF3, PCl5, and IF7) have more than 8 electrons around their central atoms. Therefore, the correct answer is:

**Option 4: All the 3 are super octet molecules.**

---