Question
Which one of the following statements is not true?
A.
In vulcanisation, 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 - $$S$$ is a copolymer of butadiene and styrene
D.
Natural rubber is a 1, 4 - polymer of isoprene
Answer :
Natural rubber has the $$trans$$ - configuration at every double bond
Solution :
Natural rubber is $$cis$$ - 1, 4 - polyisoprene and has all $$cis$$ configurations about the double bond as shown below. It is prepared from latex which is obtained in $$cis$$ form called Havia Rubber latex is obtained from rubber tree ( Havea brasiliensis ).
Natural rubber is $$cis$$ - 1, 4 - polyisoprene and has all $$cis$$ configurations about the double bond as shown below. It is prepared from latex which is obtained in $$cis$$ form called Havia Rubber latex is obtained from rubber tree ( Havea brasiliensis ).