Discussion
Natural rubber is a polymer of
Answer: D
Correct answer: isoprene
Natural rubber is cis-1,4-polyisoprene, tapped from Hevea brasiliensis. The all-cis configuration is what prevents the chains from packing and crystallising at rest, leaving them coiled and free to be extended - the basis of its elasticity. The trans isomer of the same polymer is gutta percha, a hard and non-elastic material, which shows how much the geometry matters.
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