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Question 870012
JEE Chemistry · Medium

Biomolecules and Polymers: Mixed MCQ

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MixedMediumQuestion 870012

Question

Natural rubber is a polymer of:
  1. A
    2-methylbuta-1,3-diene (isoprene)
    Correct
  2. B
    Buta-1,3-diene
  3. C
    Styrene
  4. D
    Chloroprene

Correct answer

2-methylbuta-1,3-diene (isoprene)

Explanation

Natural rubber = cis-polyisoprene (isoprene monomer: CH₂=C(CH₃)−CH=CH₂). Vulcanisation with sulphur cross-links chains, improving elasticity and strength. Gutta-percha is trans-polyisoprene (hard, non-elastic).

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