Question

On complete hydrogenation, natural rubber produces(a) ethylene–propylene copolymer (b) vulcanised rubber(c) polypropylene(d) polybutylene

Answer 1

B) Vulcanises rubber

Answer 2

Answer:

(a) ethylene–propylene copolymer is the correct answer.

Explanation:

Polymers are macromolecules having high molecular mass and small repeating monomer units.

Synthesis of polymers is polymerisation.

Natural rubber is obtained from rubber tree that is latex.

It is obtained in the form of colloidal suspension.

It is a linear polymer of isoprene.

Isoprene is 2 methyk-1, 3 butadiene.

The IUPAC name for natural rubber is cis-1, 4 polyisopropene.

It has long flexible chains and weak intermolecular forces.

It shows elastic properties.

Natural rubber in presence of H2/Li gives a copolymer of ethylene and propylene. This is hydrogenation process.

(CH2-C-CH3=CH-CH2)n ===> (CH2-CH-CH3-CH2-CH2)n

Hence,

(a) ethylene–propylene copolymer is the correct answer.