Question

Which of the following polymers is a copolymer: Buna-S, Polythene, or PVC?

• A. Polythene
• B. PVC
• C. Buna-S
• D. All of these

Hint:

A copolymer is formed from two different monomers. Examples: Buna-S (butadiene + styrene) and Buna-N (butadiene + acrylonitrile).

Answer 1

The Correct Option is C

Concept: Polymers are classified based on the number of different monomers used in their formation.

• Homopolymer: Formed from only one type of monomer.
• Copolymer: Formed from two or more different monomers.

Step 1: {Examine each polymer.} Polythene: Formed from a single monomer, ethene \((CH_2=CH_2)\). Thus, it is a homopolymer. PVC (Polyvinyl Chloride): Formed from one monomer, vinyl chloride \((CH_2=CHCl)\). Thus, it is also a homopolymer. Buna-S: Buna-S is produced by copolymerization of:

• Butadiene
• Styrene

Since it is formed from two different monomers, it is a copolymer.
Step 2: {Identify the correct option.} Therefore, the copolymer among the given polymers is \[ \text{Buna-S} \]