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Depict a free radical mode of addition p...

Depict a free radical mode of addition polymerisation in isoprene.

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Isoprene is a monomer of natural rubber. The free radical mechanism may be depicted as :
Chain initiation : `" Initiator "rarr overset(+)R" (radical)"`

Chain propagation

`R-CH_(2)-underset(CH_(3))underset("| ")"C "=CH-CH_(2)-CH_(2)-underset(CH_(3))underset("| ")"C "=CH-CH_(2)rarr rarr rarr`
`R-CH_(2)-underset(CH_(3))underset("| ")"C "=CH-CH_(2)[--CH_(2)-underset(CH_(3))underset("| ")"C "=CH-CH_(2)--]_(n)CH_(2)-underset(CH_(3))underset("| ")"C "=CH-Coverset(*)H_(2)`
`overset("Chain termination")(R-CH_(2)-underset(CH_(3))underset("| ")"C "=CH)-CH_(2)[--CH_(2)-underset(CH_(3))underset("| ")"C "=CH-CH_(2)--]_(n)CH_(2)-underset(CH_(3))underset("| ")"C "=Coverset(*)H_(2)+overset(*)RrarrR underset("Natural rubber")([--CH_(2)-underset(CH_(3))underset("| ")"C "=CH-CH_(2)--]_(n))R`
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