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How does the presence of double bonds in...

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

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1) Natural rubber is cis poly isoprene. It is obtained by polymerisation of isoprene . The poly merisation takes place at 1,4 positions .
2) In rubber molecule double bonds are between `C_2` and `C_3` of the monomer isoprene .
3) These double bonds (cis) do not allow the polymer chain to come closer. Therefore only weak vander waal's forces are present .
4) The chains are not linear ,they can be strectched just like springs and exhibits elastic properties .
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