Which of the following is a semisynthetic polymer?

Options

A. Natural rubber
B. Gun cotton
C. Cellulose
D. Nucleic acids

Answer

To determine which of the following is a semisynthetic polymer, we first need to understand the classification of polymers based on their origin.

### Step-by-Step Solution:

1. **Understand Polymer Classification**:
- Polymers can be classified into three categories:
- **Natural Polymers**: These are obtained directly from natural sources (e.g., cellulose, proteins, starch, natural rubber).
- **Semisynthetic Polymers**: These are derived from natural polymers but have been chemically modified to enhance their properties or utility (e.g., cellulose acetate, cellulose nitrate).
- **Synthetic Polymers**: These are entirely man-made through chemical processes (e.g., nylon, polythene).

2. **Identify the Options**:
- We need to look at the options provided in the question to identify which one is a semisynthetic polymer. The options include:
- Natural rubber
- Nucleic acids
- Cellulose
- Guncotin

3. **Analyze Each Option**:
- **Natural Rubber**: This is a natural polymer obtained from rubber trees, so it does not fit the semisynthetic category.
- **Nucleic Acids**: These are biological macromolecules formed from nucleotide units and are also naturally occurring, thus not semisynthetic.
- **Cellulose**: This is a natural polymer derived from plant cell walls, so it is not semisynthetic.
- **Guncotin**: This is a semisynthetic polymer derived from natural sources (specifically, it is a modified form of natural rubber).

4. **Conclusion**:
- Among the given options, **Guncotin** is the only semisynthetic polymer, as it is derived from a natural source and has been chemically modified.

### Final Answer:
The semisynthetic polymer from the options provided is **Guncotin**.