Question

The addition polymer which is/are co-polymer are:
(i) Neoprene
(ii) Buna-N
(iii) Nylon-66
(iv) SBR

(A) (iv)
(B) (ii) & (iv)
(C) (iii) & (iv)
(D) (i), (iii) & (iv)
(E) None of the above

Answer 1

Hint: We know that polymer is a huge compound formed from joining of repeating units (monomers) in a large scale. This process of polymer formation from monomers is coined as polymerization. Some examples of polymers are polyethene, nylon-6,6 etc.

Complete step by step solution:
Let’s understand classification of polymers based on their mode of polymerization. There are two kinds of polymerization reactions, addition polymerization and condensation polymerization. In addition polymerization, same or different monomers joined together to result a polymers such as in case of formation of polyethene and in condensation polymerization, repetitive condensation

Let’s understand homopolymer and copolymer. Homopolymer is the polymer which is formed from a single monomer by addition polymerization, such as ethene.
Copolymer is the polymer which is formed by addition polymerization of two different monomers, such as Buna-N, Buna-S etc.

Let’s identify the copolymer among the given options.
The monomer of neoprene is 2-chloro-1,3-butadiene. As only one monomer forms the neoprene, so it is homopolymer.The monomers of Buna-N are 1,3-butadiene and acrylonitrile. So, Buna-N is a copolymer.
Nylon-66 is a condensation polymer. The monomers of Nylon-66 are adipic acid and hexamethylenediamine. The full form of SBR is Styrene Butadiene Rubber. So, the monomers are Styrene and Butadiene. Therefore, SBR is also a copolymer.

So, the correct answer is Option B.

Note: The classifications of polymer based on its source are natural polymer, semisynthetic polymer and synthetic polymer.

Natural polymers are those polymers which are found in animals and plants, such as, protein, cellulose, rubber, starch, etc.

Semi synthetic polymers are the polymers mostly obtained by chemical modifications of naturally occurring polymers. Some examples are vulcanized rubber, rayon, etc.

Synthetic polymers are the polymers which are made in factories, such as, Buna-S, Buna-N etc.