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What is the role of benzoyl peroxide in ...

What is the role of benzoyl peroxide in addition polymerisation of alkenes? Explain its mode of action with the help of an example

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Benzoyl peroxide acts as an initiator in free radical addition polymerisation of alkenes by providing chain initiation.
`C_(6)H_(5)-underset(O)underset(||)C-O-O-underset(O)underset(||)C-C_(6)H_(5)overset("Heat")rarr2C_(6)H_(5)-underset(O)underset(||)C-overset(*)Orarrunderset("radical")underset("Phenyl")(2C_(6)overset(*)H_(5))+2CO_(2)`
The radical formed adds to the carbon-carbon double alkene molecule to form a new free of radical.

The new free radical adds to a double bond of monomer to form a larger free radical which adds to another alkene molecules and ultimately forms the polymer.
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