Which of the following is natural polymer?

Options

A. Polyisoprene
B. Polybutadiene
C. Polyvinyl chloride
D. Polyethylene

Answer

To determine which of the given options is a natural polymer, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Polyisoprene
- B) Polybutadiene
- C) Polyvinyl Chloride (PVC)
- D) Polyethylene

2. **Analyze Option A: Polyisoprene**:
- Polyisoprene is a polymer made from the monomer isoprene (2-methyl buta-1,3-diene).
- It is known to be the primary component of natural rubber, which is harvested from the bark of the rubber tree, Hevea brasiliensis.
- Since it is derived from a natural source, polyisoprene is classified as a natural polymer.

3. **Analyze Option B: Polybutadiene**:
- Polybutadiene is a synthetic polymer made from the monomer butadiene (1,3-butadiene).
- It is commonly used in the production of synthetic rubber.
- Therefore, polybutadiene is not a natural polymer.

4. **Analyze Option C: Polyvinyl Chloride (PVC)**:
- PVC is a synthetic polymer made from the monomer vinyl chloride.
- It is widely used in construction and plumbing materials.
- Thus, PVC is also not a natural polymer.

5. **Analyze Option D: Polyethylene**:
- Polyethylene is a synthetic polymer made from the monomer ethylene (ethene).
- It is commonly used in packaging materials and plastic bags.
- Hence, polyethylene is not a natural polymer.

6. **Conclusion**:
- Among the options analyzed, only **polyisoprene** is a natural polymer.
- Therefore, the correct answer is **Option A: Polyisoprene**.

### Final Answer:
**The natural polymer among the options is Polyisoprene (Option A).**

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