During the vulcanization of rubber,natural rubber is heated with sulphur and some other additive to:

What are carbon fibers used for?

Which among the following polymers is heat resistant and used to obtain oil seals?

Identify the monomer used to prepare Teflon.

Which of the following is currently used as a tyre cord?

Given below are two statements,one is Assertion $(A)$ and the other is Reason $(R).$
Assertion $(A):$ Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties.
Reason $(R):$ The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with a coiled structure.
In the light of the above statements,choose the correct one from the options given below: