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Which of the following statements is not true ?
1) Natural rubber is 1, 4 – polymer of isoprene
2) In vulcanization, the formation of sulphur bridges between different chains make rubber harder
3) Buna-S is a copolymer of butadiene and styrene
4) Natural rubber has the trans-configuration at every double bond
4) Natural rubber has the trans-configuration at every double bond