Which one of the following statement 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-S is a copolymer of butadiene and styrene
(d) Natural rubber is a 1, 4 - polymer of isoprene
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b) is false as_. natural rubber has all cis configurations.
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Answer: b
Explanation: All natural rubbers has the cis configuration made up of linear polymer of cis-1,4-polyisoprene
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