Polymersation may occur through intermediate formation of:

Options

A. Carbocations
B. Carbanions
C. Free radicals
D. Carbenes

Answer

**Step-by-Step Solution:**

1. **Understand Polymerization**:
- Polymerization is the process where monomer molecules react chemically to form polymer chains or networks. This can occur through various mechanisms.

2. **Identify Types of Intermediates**:
- During polymerization, certain intermediates can be formed. The common intermediates include:
- Free radicals
- Carbanions
- Carbocations

3. **Evaluate Each Intermediate**:
- **Carbocation**: This is a positively charged carbon species that can act as an intermediate in polymerization reactions. Thus, it is a valid intermediate.
- **Free Radical**: This is an uncharged species with an unpaired electron. Free radicals are also commonly formed during polymerization and are valid intermediates.
- **Carbene**: Carbenes are neutral species with a divalent carbon atom. They are not typically involved as intermediates in polymerization processes because they do not maintain the necessary electron count for stable polymer formation.

4. **Conclusion**:
- Based on the evaluation, the intermediates that can be formed during polymerization are:
- Carbocation (valid)
- Free Radical (valid)
- Carbene (not valid)

5. **Final Answer**:
- Polymerization may occur through the intermediate formation of free radicals and carbocations, but not carbenes.