pA polystyrene of formula \( \mathrm{Br}_{3} \mathrm{C}_{6} \mathrm{H}_{2}\left(\mathrm{C}_{8} \...

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pA polystyrene of formula \( \mathrm{Br}_{3} \mathrm{C}_{6} \mathrm{H}_{2}\left(\mathrm{C}_{8} \mathrm{H}_{8}\right)_{n} \) was prepared by heating styrene with tribromobenzyl peroxide in the absence of air. It was found to contain \( 10.46 \% \) bromine by mass. The value of \( n \) is \( (\mathrm{Br}=80) \)/pp(a) 20/pp(b) 21/pp(c) 19/p
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