Which are for elastomers ?

Options

A. They posses elasticity
B. These possess weakest intermolecular forces of attraction between polymer chains
C. These possess strongest inter molecular forces of attraction between polymer chains
D. Buna rubber is an example of elastomer

Explanation

To determine which statements are correct for elastomers, let's analyze each option step by step.

### Step 1: Analyze the first option
**Statement:** They possess elasticity.

**Explanation:** Elastomers are known for their elastic properties, meaning they can stretch and return to their original shape. This is a defining characteristic of elastomers.

**Conclusion:** This statement is correct.

### Step 2: Analyze the second option
**Statement:** They possess weakest intermolecular forces of attraction between polymer chains.

**Explanation:** Elastomers have weak intermolecular forces, which allow the polymer chains to move relative to each other. This weak binding is essential for their elastic properties.

**Conclusion:** This statement is correct.

### Step 3: Analyze the third option
**Statement:** They possess strongest intermolecular forces of attraction between polymer chains.

**Explanation:** This statement is incorrect for elastomers. Strong intermolecular forces are characteristic of thermosetting polymers, not elastomers. Elastomers specifically have weak intermolecular forces that allow for flexibility and elasticity.

**Conclusion:** This statement is incorrect.

### Step 4: Analyze the fourth option
**Statement:** Buna rubber is an example of elastomer.

**Explanation:** Buna rubber is indeed a type of elastomer, specifically a synthetic rubber. It is widely used in various applications due to its elastic properties.

**Conclusion:** This statement is correct.

### Final Conclusion
Based on the analysis:
- The correct options for elastomers are **1, 2, and 4**.

### Summary of Correct Options
1. They possess elasticity. (Correct)
2. They possess weakest intermolecular forces of attraction between polymer chains. (Correct)
3. They possess strongest intermolecular forces of attraction between polymer chains. (Incorrect)
4. Buna rubber is an example of elastomer. (Correct)