Which one of the following statements is not true? (a) Buna-S is a ...

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Which one of the following statements is not true?
(a) Buna-S is a copolymer of butadiene and styrene
(b) Natural rubber is a 1,4-polyisoprene
(c) In vulcanisation, the formation of sulphur bridges between different chains make rubber harder and stronger
(d) Natural rubber has the trans-configuration at every double bond
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