Question

Which of the following is not a co-polymer?

• A. Buna-S rubber
• B. Neoprene rubber
• C. Bakelite
• D. Urea - Formaldehyde

Hint:

The names of some polymers give clues to their composition.
"Buna-S" stands for Butadiene-Styrene.
Names like "Urea-Formaldehyde" explicitly state the two monomers.
When a polymer is named after a single monomer, like Polystyrene or Neoprene (polychloroprene), it's a homopolymer.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
We must distinguish between a co-polymer and a homopolymer among the given options.

Step 2: Key Formula or Approach:
- A

Homopolymer is a polymer formed from the polymerization of a single type of monomer.
- A

Co-polymer is a polymer formed from two or more different types of monomers.
We need to know the monomer(s) for each polymer listed.

Step 3: Detailed Explanation:
Let's analyze the monomers of each polymer:
-

(A) Buna-S rubber: This is a

co-polymer. Its name is an abbreviation for its monomers: Bu (for 1,3-Butadiene) and Na-S (for Styrene, with Na indicating the original sodium catalyst).
-

(B) Neoprene rubber: This is a

homopolymer. It is formed by the addition polymerization of a single monomer: chloroprene (2-chloro-1,3-butadiene). Its systematic name is polychloroprene.
-

(C) Bakelite: This is a

co-polymer. It is a condensation polymer made from two different monomers: Phenol and Formaldehyde.
-

(D) Urea - Formaldehyde: As its name clearly indicates, this is a

co-polymer made from Urea and Formaldehyde monomers via condensation polymerization.
Therefore, Neoprene rubber is the only homopolymer in the list.

Step 4: Final Answer:
Neoprene rubber is not a co-polymer.