Which of the following is a homopolymer ?

Options

A. Bakelite
B. Nylon 6,6
C. Neoprene
D. Buna-S

Explanation

To determine which of the following is a homopolymer, we need to understand the definition of a homopolymer and analyze the given options.

### Step-by-Step Solution:

1. **Understand the Definition of Homopolymer**:
- A homopolymer is a type of polymer that is made up of only one kind of monomer unit. This means that all the repeating units in the polymer chain are identical.

2. **Identify the Options**:
- The question provides several options, including Bacolide, Nylon 6-6, Neoprene, and Bionaceous. We need to analyze each option to see if it consists of only one type of monomer.

3. **Analyze Bacolide**:
- Bacolide is formed from two different monomers: phenol and formaldehyde. Since it contains more than one type of monomer, Bacolide is not a homopolymer; it is a copolymer.

4. **Analyze Nylon 6-6**:
- Nylon 6-6 is synthesized from two different monomers: adipic acid and hexamethylenediamine. As it also contains two different types of monomers, Nylon 6-6 is not a homopolymer; it is a copolymer.

5. **Analyze Neoprene**:
- Neoprene is made from only one type of monomer, which is chloroprene. Since it consists of only one type of monomer unit, Neoprene is classified as a homopolymer.

6. **Analyze Bionaceous**:
- Bionaceous is formed from two different monomers: 1,3-butadiene and styrene. Therefore, it is also not a homopolymer; it is a copolymer.

7. **Conclusion**:
- After analyzing all the options, we find that the only homopolymer among the given choices is Neoprene.

### Final Answer:
The correct answer is **Neoprene**.