Which of the following are true for Bakelite?

Options

A. a) Cross linked polymer
B. b) Condensation polymer
C. c) Thermosetting polymer
D. d) Addition polymer

Explanation

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

### Step-by-Step Solution:

1. **Understanding Bakelite**:
- Bakelite is a synthetic polymer formed from the condensation reaction of phenol and formaldehyde.
- The reaction occurs in a basic medium and involves the application of heat.

2. **Identifying the Type of Polymer**:
- **Cross-linked Polymer**: Bakelite is indeed a cross-linked polymer. During its formation, the polymer chains are interconnected, creating a three-dimensional network.
- **Condensation Polymer**: Bakelite is formed through a condensation reaction, where water is released as a byproduct during the reaction between phenol and formaldehyde.
- **Thermosetting Polymer**: Bakelite is classified as a thermosetting polymer because once it is set (hardened) by heat, it cannot be remolded or reused. It becomes irreversibly hard upon heating.
- **Adhesion Polymer**: This term is not typically used to describe Bakelite. While Bakelite can be used as an adhesive, it is not classified as an adhesion polymer.

3. **Conclusion**:
- Based on the analysis:
- Option A: Cross-linked polymer - **True**
- Option B: Condensation polymer - **True**
- Option C: Thermosetting polymer - **True**
- Option D: Adhesion polymer - **False**

### Final Answer:
The true statements for Bakelite are:
- A: Cross-linked polymer (True)
- B: Condensation polymer (True)
- C: Thermosetting polymer (True)
- D: Adhesion polymer (False)