Which of the following is not true?

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(B) The statement in option $B$ is incorrect because natural rubber (cis$-1,4-$polyisoprene) has a 'cis' configuration at every double bond,not a 'tra

Vedclass · Accepted Answer

Natural rubber has 'cis' configuration at every double bond.

Vedclass · Answer

(B) The statement in option $B$ is incorrect because natural rubber (cis$-1,4-$polyisoprene) has a 'cis' configuration at every double bond,not a 'trans' configuration. Gutta-percha is the 'trans' isomer of natural rubber.Buna-$S$ is a co-polymer of $1,3$-butadiene and styrene,which is correct.Vulcanisation makes rubber harder and stronger by forming cross-links between polymer chains.Natural rubber is indeed a $1,4$-polymer of isoprene ($2$-methyl-$1,3$-butadiene).

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