Which of the following is incorrect

Options

A. Polyethylene contains doboule bonds
B. The monomer used to make teflon is `C_(2)F_(4)`
C. Condensation polymers are also known as step growth polymers.
D. A denatured protein could have the same primary structure as the active protein

Answer

To solve the question, we need to analyze each of the statements provided and identify which one is incorrect.

### Step-by-Step Solution:

1. **Analyze Statement A**:
- The statement claims that "polyethylene contains double bonds."
- Polyethylene is a polymer made from the monomer ethylene (C2H4), which does contain a double bond. However, when ethylene polymerizes to form polyethylene, the double bonds are broken, and the resulting polymer consists of long chains of carbon atoms connected by single bonds.
- **Conclusion**: This statement is incorrect because polyethylene does not contain double bonds.

2. **Analyze Statement B**:
- The statement claims that "the monomer used to make Teflon is C2F7."
- Teflon, also known as polytetrafluoroethylene (PTFE), is made from the monomer tetrafluoroethylene (C2F4), not C2F7.
- **Conclusion**: This statement is also incorrect, as the correct monomer is C2F4.

3. **Analyze Statement C**:
- The statement mentions "condensation polymerization is also known as step-growth polymerization."
- Condensation polymerization involves the stepwise reaction between monomers, often producing small molecules (like water) as byproducts. This process can be referred to as step-growth polymerization.
- **Conclusion**: This statement is correct.

4. **Analyze Statement D**:
- The statement claims "the denatured protein could have the same primary structure as the active protein."
- Denaturation of proteins typically disrupts secondary and tertiary structures but does not affect the primary structure (the sequence of amino acids).
- **Conclusion**: This statement is correct.

### Final Conclusion:
- The incorrect statement is **Statement A**, as polyethylene does not contain double bonds.