Question

Which of the following is an addition and co-polymer both? (A) Buna-S (B) Buna-N (C) Polythene (D) Both (A) and (B)

Short answer

The correct answer is (D) Both (A) and (B), as both Buna-S and Buna-N are addition polymers and copolymers.

Step-by-step solution

Analyzing option (A) Buna-S

Buna-S is formed from a copolymerization reaction of styrene and butadiene. Since it involves copolymerization (two monomers) and both monomers have a double bond, it is indeed an addition polymer and a copolymer.

Analyzing option (B) Buna-N

Buna-N is formed from a copolymerization reaction of propylene and acrylonitrile. Similar to Buna-S, it also involves copolymerization (two monomers) and both monomers have a double bond, making it an addition polymer and a copolymer.

Analyzing option (C) Polythene

Polythene is a polymer formed from the polymerization of ethene monomers. While it is an addition polymer due to the presence of a double bond in ethene, it is not a copolymer since it is only made up of one type of monomer.

Comparing options (A) and (B) with option (D)

Option (D) states that both (A) and (B) are an addition polymer and a copolymer. As we have analyzed in steps 1 and 2, both Buna-S (A) and Buna-N (B) are indeed addition polymers and copolymers. Hence, the correct option is (D) Both (A) and (B).