JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl024
Which statements about natural rubber and related materials are correct?
ANatural rubber is cis-1,4-polyisoprene
BGutta-percha is the trans-1,4-polyisoprene
CVulcanisation introduces sulfur cross-links between chains
DVulcanisation removes all the double bonds of natural rubber
Answer: A, B, C
The cis isomer is natural rubber and the trans is gutta-percha. Sulfur cross-links chains at only some of the allylic sites, so many double bonds remain.