In which one of the following type of polymerization generally no initiator is required

Options

A. Cationic polymerization
B. Anionic polymerization
C. Free radical polymerization
D. Condensation polymerization

Answer

To solve the question regarding which type of polymerization generally does not require an initiator, we can analyze each option provided:

1. **Cationic Polymerization**: This type of polymerization requires an initiator, typically a Lewis acid or a strong acid. The initiator is necessary to generate the cation that starts the polymerization process.

2. **Anionic Polymerization**: Similar to cationic polymerization, anionic polymerization also requires an initiator. This can include various compounds such as amides or organolithium reagents to generate the anion needed to initiate the polymerization.

3. **Free Radical Polymerization**: Free radical polymerization requires an initiator as well, which can be a free radical source such as HBr or other radical generators. The initiator is essential to produce the free radicals that will start the polymerization process.

4. **Condensation Polymerization**: This type of polymerization does not require an initiator. Condensation polymerization occurs when monomers react to form a polymer and a small molecule (often water or methanol) is eliminated. The reaction can proceed without the need for an external initiator.

Based on the analysis of the options, the correct answer is:

**Condensation Polymerization (Option 4)** does not require an initiator.

### Steps:
1. Identify the types of polymerization listed in the options.
2. Analyze each type to determine if an initiator is required.
3. Conclude that condensation polymerization is the only type that does not require an initiator.