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Write names and chemical farmulae of mon...

Write names and chemical farmulae of monomers used in preparing Buna-S.

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The materal Buna-S derives Bu for butadiene, Na for sodium and S for styrene.
The monomers used in preparing Buna-S are (i) Butadiene, `CH_(2)=CH-CH=CH_(2)` and (ii) Styrene,
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