Question

Which statement is correct ?

• A. Buna-N is a natural polymer.
• B. Buna-S is a synthetic and linear thermosetting polymer.
• C. Neoprene is an addition copolymer used in plastic bucket manufacturing.
• D. Synthesis of Buna-S needs nascent oxygen.

Hint:

[Image showing monomers of Buna-S: 1,3-Butadiene and Styrene] Buna-S stands for {Bu}tadiene {Na}trium (Sodium) {S}tyrene. Sodium was originally used as the catalyst for the polymerization.

Answer 1

The Correct Option is D

Step 1: (A) is false; Buna-N is synthetic (Butadiene + Acrylonitrile).
Step 2: (B) is false; Buna-S is an elastomer, not a thermosetting polymer.
Step 3: (C) is false; Neoprene is a homopolymer of chloroprene.
Step 4: (D) is correct in the sense that the polymerization of Buna-S (Butadiene + Styrene) is a free-radical process initiated by peroxides which generate radicals/oxygen species to start the chain.