A natural linear polymer of 2-methyl -1,3-butadiene becomes hard on tr – InterviewSolution

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1.	A natural linear polymer of 2-methyl -1,3-butadiene becomes hard on treatment with sulphur between 373 to 415 and -S-S- bonds are formed between chains. Write the structure of the product of this treatment ?
Answer» SOLUTION :The NATURAL linear polymer of 2-methyl -1,3- butadiene is CIS -polyisoprene (natural rubber) . On heating with sulphur between `373-415 K`, vulcanization occurs as a result of which `-S-S-` bridges or CROSS- links are introduced between polymer chains through their reactive allylic positions as shown below :

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