Which of the following polymer turns yellowish on exposure to sunlight

Options

A. Polystyrene
B. Nylon
C. Polyethylene
D. Styrene butadiene resin

Answer

To determine which polymer turns yellowish on exposure to sunlight, we can analyze the given options one by one:

### Step 1: Identify the polymers
The options provided are:
1. Polystyrene
2. Nylon
3. Polyethylene
4. Styrene butadiene resin

### Step 2: Analyze each polymer
- **Polystyrene**: This polymer is known to undergo photodegradation when exposed to UV light from sunlight. This degradation can cause the polymer to turn yellowish over time.

- **Nylon**: Nylon is generally resistant to UV light and does not typically change color when exposed to sunlight.

- **Polyethylene**: Similar to nylon, polyethylene is also resistant to UV light and does not turn yellowish under normal conditions.

- **Styrene butadiene resin**: This polymer is also resistant to UV light and does not exhibit significant yellowing when exposed to sunlight.

### Step 3: Conclusion
Based on the analysis, **polystyrene** is the polymer that turns yellowish on exposure to sunlight.

### Final Answer
The polymer that turns yellowish on exposure to sunlight is **polystyrene**.

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