Question

Natural rubber or raw rubber consists of basic material latex which is a dispersion of isoprene. During the treatment, this isoprene forms a high molecular weight polymer of isoprene. Natural rubber can be obtained from five hundred different species of plants.
Which rubber is not a polydiene?

• A. Polyisoprene
• B. Polychloroprene
• C. Thiokal rubber
• D. Nitrile rubber

Answer 1

The correct option is C Thiokal rubber

Thiokol rubber is a type of artificial elastomer, which is invariably a polymer.

it can be prepared by the condensation of 1,2-dichloroethane with sodium polysulphide. It does not contain any $C=C$ bond. So it is not a polydiene.