Question

Which from following polymer is obtained by addition polymerization?

• A.

  

• B. \([\text{NH}-(\text{CH}_2)_5-\text{CO}]_n\)
• C.

  

• D.

  

Hint:

Addition polymers form from unsaturated monomers without loss of small molecules.

Answer 1

The Correct Option is A

Step 1: Quick test:
An addition polymer has a backbone made only of carbon atoms. Polyesters and polyamides contain O or N in the backbone.

Step 2: Apply:
Option (A) has a pure carbon backbone $\text{-CH}_2\text{-CH(CN)-}$. Option (B) has N in the chain, and options (C) and (D) have ester oxygen in the chain. So (A).

Final Answer:
Polyacrylonitrile. \[ \boxed{\text{(A)}} \]