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

cbse
polymers

#1

Natural rubber is cis-polyisoprene which is shown as:

The cis-configuration at double bonds does not allow the polymer chains to come closer for effective interactions and hence, intermolecular forces are quite weak. As a result, natural rubber (cis-polyisoprene) has a randomly coiled structure and hence shows elasticity.