Which of the following process can be used to prepare polystyrene?

Options

A. Anionic
B. Cationic
C. Free radical
D. Benzyne

Answer

To determine which process can be used to prepare polystyrene, we need to analyze the options given and understand the polymerization methods involved in creating polystyrene.

### Step-by-Step Solution:

1. **Understanding Polystyrene**:
- Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer styrene. The chemical structure of styrene includes a vinyl group (C=C) which is essential for polymerization.

2. **Identifying Polymerization Methods**:
- The common methods of polymerization include:
- Anionic polymerization
- Cationic polymerization
- Free radical polymerization
- Coordination polymerization

3. **Evaluating the Options**:
- **Anionic Polymerization**: This method involves the use of an anion to initiate the polymerization process. It is not typically used for styrene due to the stability of the styrene monomer.
- **Cationic Polymerization**: This method uses a cation to initiate polymerization. While it can be used for some types of monomers, styrene is not commonly polymerized this way.
- **Free Radical Polymerization**: This is the most common method for polymerizing styrene. It involves the formation of free radicals that initiate the polymerization process by breaking the double bond in the styrene monomer.
- **Benzyne**: This is a reactive intermediate and not a polymerization method.

4. **Conclusion**:
- The correct process to prepare polystyrene is **Free Radical Polymerization**. This method typically uses a catalyst such as benzoyl peroxide to initiate the reaction.

### Final Answer:
The process that can be used to prepare polystyrene is **Free Radical Polymerization**.

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