Which of the following are step growth as well as condensation polymer

Options

A. Nylon-66
B. Bakelite
C. Nylon-66
D. Buna-S

Explanation

To determine which of the following are both step growth and condensation polymers, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Step Growth and Condensation Polymers**:
- Step growth polymers are formed through the reaction of bifunctional or multifunctional monomers. This process can lead to the formation of dimers, trimers, and eventually long-chain polymers.
- Condensation polymers are formed when monomers join together, releasing a small molecule (like water) as a byproduct.

2. **Analyzing Nylon 6-6**:
- Nylon 6-6 is made from hexamethylene diamine and adipic acid.
- This polymerization involves the reaction of two different monomers, which results in the elimination of water.
- Therefore, Nylon 6-6 is both a step growth polymer and a condensation polymer.

3. **Analyzing Bakelite**:
- Bakelite is formed from phenol and formaldehyde.
- The reaction between these monomers also leads to the release of water and results in a network polymer.
- Thus, Bakelite is also classified as a step growth condensation polymer.

4. **Analyzing Buna Ester**:
- Buna Ester is formed from the copolymerization of butadiene and styrene.
- This process does not involve the elimination of a small molecule, which is characteristic of addition polymers rather than condensation polymers.
- Therefore, Buna Ester is not a step growth condensation polymer.

5. **Conclusion**:
- From the analysis, we can conclude that:
- **Option 1 (Nylon 6-6)**: Correct (Step growth and condensation polymer)
- **Option 2 (Bakelite)**: Correct (Step growth and condensation polymer)
- **Option 3 (Nylon 6-6)**: Correct (Reiteration)
- **Option 4 (Buna Ester)**: Incorrect (Not a step growth condensation polymer)

### Final Answer:
- The correct options that are step growth as well as condensation polymers are **Nylon 6-6** and **Bakelite**.