Assertion (A) Network polymers are thermosetting
Reason (R ) Network Polymers have high molecular mass

Options

A. Assetion and Reason both are correct statement But reason does not explain Assertion
B. Assertion and Reason both are correct statements and Reason explains the Assertion.
C. Both assertion and reason are wrong sttement s
D. Assertion is correct statement and Reason is worng statement.

Explanation

To solve the question, we need to analyze the assertion and reason provided:

**Assertion (A):** Network polymers are thermosetting.
**Reason (R):** Network polymers have high molecular mass.

### Step-by-Step Solution:

1. **Understanding Network Polymers:**
- Network polymers are a type of polymer that consists of a three-dimensional network of covalent bonds. This structure gives them unique properties.

2. **Evaluating the Assertion:**
- The assertion states that network polymers are thermosetting. This is true because thermosetting polymers, once cured or set, cannot be remolded or reshaped. They undergo extensive crosslinking, which makes them rigid and infusible after the initial heating process.

3. **Evaluating the Reason:**
- The reason states that network polymers have high molecular mass. This is also true because the extensive crosslinking in network polymers results in a larger molecular structure, leading to high molecular mass.

4. **Analyzing the Relationship:**
- While both the assertion and reason are correct statements, the reason does not explain why network polymers are thermosetting. High molecular mass does not inherently mean that a polymer is thermosetting; rather, it is the crosslinking that contributes to the thermosetting nature.

5. **Conclusion:**
- Since both the assertion and reason are correct but the reason does not explain the assertion, the correct answer is that both statements are true, but the reason does not justify the assertion.

### Final Answer:
- **Option 1:** Assertion and reason both are correct, but the reason does not explain the assertion.