Q. Which of the following statements is not true?
A) Natural rubber is a 1,4-polymer of isoprene
B) In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger
C) Natural rubber has the trans-configuration at every double bond
D) Buna-S is a copolymer of butadiene and styrene
Explanation
[Solution from source] Natural rubber is cis-1,4-polyisoprene, so saying it has the trans configuration at every double bond is false; the all-trans polymer is gutta-percha. The other statements are true: vulcanization cross-links chains with sulphur, and Buna-S is a butadiene–styrene copolymer. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.