Question

Which one of the following statements is not true?

• A. In vulcanization the formation of sulphur bridges between different chains make rubber harder and stronger.
• B. Natural rubber has the trans-configuration at every double bond.
• C. Buna-N is a copolymer of butadiene and acrylonitrile.
• D. Natural rubber is a cis-1,4-polyisoprene.

Answer 1

The correct option is B Natural rubber has the trans-configuration at every double bond.

Isomer cis-1,4-polyisoprene is a major ingredient of nature rubber whereas trans-1,4-polyisoprene is a major ingredient of gutta-percha.
All statements expect (b) are correct.