Which one of the following statements is not true?

1. Buna-S is a copolymer of butadiene and styrene
2. Natural rubber is a 1, 4-polymer of isoprene
3. In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger
4. Natural rubber has the trans configuration at every double bond

Solution

Natural rubber is cis-1,3 polyisoprene and has only cis configuration about the double bond as shown below

whereas in Gutta-percha, only trans configuration exists about the double bond. Buna-S is a copolymer of butadiene and styrene.

Asked in: MHT CET Full Test 5

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