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JEE Advanced · 2016 · 22 May 2016 · Paper 1 · Polymers

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On complete hydrogenation, natural rubber produces
  1. (A)ethylene-propylene copolymer✓ Correct
  2. (B)vulcanised rubber
  3. (C)polypropylene
  4. (D)polybutylene

Answer: (A)

Solution

Natural rubber is cis-1,4-polyisoprene, with repeating unit . On complete hydrogenation, all C=C double bonds are reduced to single bonds, giving , which can be viewed as an alternating copolymer of ethylene and propylene units (ethylene-propylene copolymer).

JEE Advanced · 2016 · 22 May 2016 · Paper 1 · Single correct option

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