Discussion

Select the correct option to match the Polymer to its Major polymeric constituent from the table given below:

Polymer		Major polymeric constituent
P	Natural rubber	I	Polyisobutylene
Q	Gutta percha	II	Polychloroprene
R	Neoprene	III	trans-1,4-polyisoprene
S	Butyl rubber	IV	cis-1,4-polyisoprene

Answer: B

The correct matching is P-IV ; Q-III ; R-II ; S-I.

Natural rubber is cis-1,4-polyisoprene, which is amorphous and elastic at room temperature (IV).
Gutta percha is trans-1,4-polyisoprene, which crystallises and is hard and leathery (III).
Neoprene is polychloroprene (II).
Butyl rubber is mainly polyisobutylene, with a little isoprene for vulcanisation (I).

Option A swaps neoprene and butyl rubber. The options pairing natural rubber with polychloroprene confuse a synthetic rubber with the natural one.

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