1.

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

Answer»

Solution :Role of benzoyl peroxide is to initiate the free RADICAL polymerization reaction, that can be easily understood by taking an example of polymerization of ethene to polyethene.
(i) Chain initiation step :

(iii) Chain terminator step :
`2C_(6)H_(5)(--CH_(2)CH_(2)--)_(n)overset(*)CH_(2)rarrC_(6)H_(5)(--CH_(2)-CH_(2)--)_(n)`
`underset("Polythene")(-CH_(2)CH_(2)CH_(2)CH_(2))(--CH_(2)-CH_(2)--)_(n)C_(6)H_(5)`


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