Which of the following polymers can be made by anionic addition polymerisation mechanism?

Answer

To determine which polymers can be made by anionic addition polymerization mechanism, we will follow these steps:

### Step 1: Understand Anionic Addition Polymerization
Anionic addition polymerization is a type of chain growth polymerization that involves the formation of a polymer from vinyl monomers. This process requires the presence of an electron-withdrawing group to stabilize the negative charge that forms during the reaction.

**Hint:** Remember that anionic polymerization involves the stabilization of carbanions through the delocalization of negative charge.

### Step 2: Identify the Characteristics of Suitable Monomers
For anionic addition polymerization to occur, the monomers must typically contain vinyl groups (C=C) and should be capable of stabilizing the negative charge. Common electron-withdrawing groups that can stabilize the carbanion include cyano groups and halogens.

**Hint:** Look for monomers that have vinyl structures and electron-withdrawing groups.

### Step 3: Analyze the Given Polymers
Now, we will analyze the provided options:
1. **Polyvinyl Chloride (PVC)** - This polymer is made from the monomer vinyl chloride (C2H3Cl), which contains a vinyl group and a chlorine atom (an electron-withdrawing group). Therefore, PVC can be made via anionic addition polymerization.

2. **Teflon (Polytetrafluoroethylene)** - Teflon is made from the monomer tetrafluoroethylene (C2F4), which also contains a vinyl group and multiple fluorine atoms (strong electron-withdrawing groups). Thus, Teflon can also be synthesized through anionic addition polymerization.

3. **Polypropylene (PP)** - Polypropylene is made from the monomer propylene (C3H6), which does not contain any significant electron-withdrawing groups to stabilize the carbanion. Therefore, polypropylene is typically produced through cationic polymerization, not anionic.

**Hint:** Check if the monomers have the necessary characteristics for anionic polymerization.

### Step 4: Conclusion
Based on the analysis, the polymers that can be made by anionic addition polymerization are:
- Polyvinyl Chloride (PVC)
- Teflon (Polytetrafluoroethylene)

Thus, the answer is that the first and second options can be made by anionic addition polymerization.

**Final Answer:** Polyvinyl Chloride (PVC) and Teflon (Polytetrafluoroethylene) can be made by anionic addition polymerization.