Question

The monomer of Buna S is:
A.Styrene and butadiene
B.Isoprene and butadiene
C.Vinyl chloride and sulphur
D.Butadiene

Answer 1

Buna S is an additional polymer. It is a synthetic based polymer. It is used in manufacturing of tyres, rubber sole, waterproof shoes etc.

Complete step by step answer:
- Polymers are defined as the high molecular masses macromolecules, which consists of repeating structural units derived from the corresponding monomers. We can say these are the combination of a large number of one or more types of small monomers. Based on mode of polymerization, polymers are of two types namely addition polymer and condensation polymers. Addition polymers are also known as chain growth polymerization as it is formed by the repeated addition of monomer molecules without elimination of anything.
- For example polythene, polyvinyl chloride, Buna S, Buna N and etc. on the other hand, condensation polymers are also known as step growth polymerization as during polymerization elimination of small molecules like water, alcohol or hydrogen chloride can take place. For example Nylon 6, 6, Terylene, Nylon 6 etc.
- 1,3 Buta-di-ene and styrene is the monomeric unit of Buna S. It is an additional copolymer. It is used in manufacturing of tyres, rubber sole, waterproof shoes etc. 1,3 Buta-di-ene and acrylonitrile is the monomeric unit of Buna N. Polymer like Buna S, Buna N and neoprene are elastomers which means their polymeric chains are held together by weak intermolecular forces and thereby it permit the polymer to be stretched.

Thus, the correct option is A.

Note:
Based on source, polymers can be of three types, namely natural polymers, semi synthetic polymers and synthetic polymers. Natural polymers are found in animals and plants. For example proteins, cellulose, starch etc. Semi synthetic polymers are like cellulose acetate which is a derivative of cellulose. Synthetic polymers are Polyethene, Nylon 6,6, Buna S and etc. Neoprene is known as artificial rubber.