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Mark out the most unlike form of polymer...

Mark out the most unlike form of polymerization of `H_(2)C=CH-CH=CH_(2)`

A

B

C

D

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The correct Answer is:
D
In polymerisation of 1,3-butadiene either 1,4- polymerisation or 1,2-polymerisation occurs. In case of 1,4-polymerisation, the double bond shifts at `C_2 and C_4` carbon, while the chain propagates from `C_1 and C_4` end. In this either trans or cis polymeric chain is formed. Option (a) and (b) represent .trans. and .cis. 1,4 polymerisation respectively.
Option (C) resembles 1,2 polymerisation, where as option (d) most unlikely to happen.
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