Which of the following can not be grouped as polylefin

Options

A. polyethene
B. polypropene
C. polystyrene
D. Bakelite

Answer

To determine which of the following options cannot be grouped as a polyolefin, we need to analyze the monomeric units of each option and their structural characteristics.

### Step 1: Understanding Polyolefins
Polyolefins are polymers derived from olefins, which are hydrocarbons that contain at least one carbon-carbon double bond (alkene). Common examples include polyethylene and polypropylene.

### Step 2: Analyzing the Options
We will look at each option and identify whether they can be classified as polyolefins based on their monomeric units.

1. **Polythene (Polyethylene)**:
- Monomer: Ethene (H2C=CH2)
- Structure: Contains a double bond between carbon atoms.
- Classification: This is a polyolefin.

2. **Polypropylene**:
- Monomer: Propene (H2C=CH-CH3)
- Structure: Contains a double bond between carbon atoms.
- Classification: This is a polyolefin.

3. **Polystyrene**:
- Monomer: Styrene (H2C=CH-C6H5)
- Structure: Contains a double bond between carbon atoms.
- Classification: This is a polyolefin.

4. **Bakelite**:
- Monomer: Phenol-formaldehyde resin (does not contain a double bond)
- Structure: Cross-linked and infusible solid, does not have the olefinic bond.
- Classification: This is not a polyolefin.

### Step 3: Conclusion
Based on the analysis, Bakelite does not contain the necessary double bond characteristic of polyolefins. Therefore, it cannot be grouped as a polyolefin.

**Final Answer**: The option that cannot be grouped as a polyolefin is **Bakelite**.

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