Which of the following is correct statement?

Options

A. Low density polyethylene is obtained under high pressure and room temperature
B. High density polyethylene has highly branched structure
C. High density polyethylene is obtained at atmospheric pressure
D. High density polythlene is more flexible than low density polyethylene

Answer

To determine which of the statements regarding low density polythene (LDP) and high density polythene (HDP) is correct, we need to analyze each statement based on the properties and production conditions of these two types of polyethylene.

### Step 1: Understand the Production Conditions
- Low Density Polythene (LDP) is produced under high pressure (around 1000-3000 atm) and high temperature (around 300-500 °C).
- High Density Polythene (HDP) is produced under lower pressure (around 6-7 atm) and lower temperature (around 333-343 K).

### Step 2: Analyze Each Statement
1. **Statement 1**: "Low density polythene is obtained under high pressure and room temperature."
- This statement is incorrect because LDP is produced under high pressure but at elevated temperatures, not room temperature.

2. **Statement 2**: "High density polythene is highly branched while linear."
- This statement is incorrect because HDP is characterized by a linear structure, while LDP is more branched.

3. **Statement 3**: "High density polythene is obtained at atmospheric pressure."
- This statement is incorrect. HDP is produced at low pressure (not atmospheric pressure).

4. **Statement 4**: "High density polythene is obtained at low density polythene. Low density polythene is obtained at high density polythene."
- This statement is incorrect. HDP and LDP are distinct types of polyethylene and one is not obtained from the other.

### Conclusion
After analyzing all the statements, we find that all provided statements are incorrect. Therefore, none of the statements are correct.

### Final Answer
None of the statements provided are correct regarding low density polythene and high density polythene.

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