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Which one of the following statement is not true?

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

Correct answer: Natural rubber has the trans-configuration at every double bond.

Solution

Natural rubber has the *cis*-configuration at every double bond, not the trans-configuration. This makes option B incorrect.

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