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How does the presence of benzoquinone in...

How does the presence of benzoquinone inhibit the free radical polymerisation of a vinyl derivative?

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Benzoquinone reacts with radical of the growing polymer chain (R.) to form a new radical (I) which is extremely unreactive since it is highly stabilized by resonance. Because of the lack of reactivity of this new radical further growth of the polymer chain is interupted and hence the raction stops.
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