Question

Which of the following is a thermosetting plastic?

• A. Nylon 6
• B. Nylon 6,6
• C. Bakelite
• D. P.V.C.

Hint:

Thermosetting plastics cannot be remoulded once set, unlike thermoplastics which soften on heating.

Answer 1

The Correct Option is C

Step 1: Define thermosetting plastics.
Thermosetting plastics are polymers that irreversibly harden when heated and cannot be remoulded. They form cross-linked structures.
Step 2: Analyze options.
- Nylon 6 and Nylon 6,6 are polyamides (thermoplastics).
- P.V.C. is a thermoplastic polymer.
- Bakelite is a phenol–formaldehyde resin, a thermosetting plastic.
Step 3: Conclusion.
Thus, the correct answer is Bakelite.