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Polymers

Short Answer Type

121.

Write the monomers used for getting the following polymers.
(i) Polyvinyl chloride (ii) Teflon (iii) Bakelite.

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122.
How does the presence of double bonds in rubber molecules influence their structure and reactivity?

From the structural point of view, the natural rubber is a linear cis-1, 4-polyisoprene. In this polymer the double bonds are located between C₂ and C₃ of isoprene units. This cis-configuration about double bonds do not allow the chains to come closer for effective attraction due to weak intermolecular attractions. Hence, the natural rubber has a coiled structure and shows elasticity.