Question

Identify thermosetting polymer from following.

• A. Ureaformaldehyde resin
• B. Polystyrene
• C. Buna-S
• D. Terylene

Hint:

Urea-formaldehyde resin is cross-linked and sets permanently on heating.

Answer 1

The Correct Option is A

Step 1: Key Fact:
Thermosets, such as bakelite and urea-formaldehyde resin, have a 3-D cross-linked structure.

Step 2: Others:
Polystyrene and terylene soften on heating, and Buna-S is an elastomer.

Step 3: Answer:
Option (A).

Final Answer:
Option (A). \[ \boxed{\text{(A) Urea-formaldehyde resin}} \]