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Why does cis polyisoprene posses elastic...

Why does cis polyisoprene posses elastic porperty?

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cis - Polyisoprene has a coiled structure in which the various polymer chains are held together by weak van der Waals forces of attraction. Due to these weak forces of attraction the polymer gets stretched when the external force is applied and return to original state when the force is withdrawn.
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PRADEEP-POLYMERS-NCERT (Examplar Problems with answers , Hints and Solutions (Short Answer Questions))
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  5. Identify the type of polymer given in the following figure.

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  7. why are rubber called elastomers?

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  8. can enzyme be called a polymer?

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  10. How is the following resin intermediate prepared and which polymer is ...

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  12. Why does cis polyisoprene posses elastic porperty?

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