Page No 435: - Chapter 15 - Polymers - Intext Solutions - Ncert Solutions class 12 - Chemistry

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Question 15.5:

Explain the difference between Buna-N and Buna-S.

Answer:

Buna − N is a copolymer of 1, 3−butadiene and acrylonitrile.

Buna − S is a copolymer of 1, 3−butadiene and styrene.

Question 15.6:

Arrange the following polymers in increasing order of their intermolecular forces.

(i) Nylon 6, 6, Buna-S, Polythene.

(ii) Nylon 6, Neoprene, Polyvinyl chloride.

Answer:

Different types of polymers have different intermolecular forces of attraction. Elastomers or rubbers have the weakest while fibres have the strongest intermolecular forces of attraction. Plastics have intermediate intermolecular forces of attraction. Hence, the increasing order of the intermolecular forces of the given polymers is as follows:

(i) Buna − S < polythene < Nylon 6, 6

(ii) Neoprene < polyvinyl chloride < Nylon 6