Identify the chain initiation step of the polymerisation of ethene in the presence of benzoyl pe...

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Identify the chain initiation step of the polymerisation of ethene in the presence of benzoyl peroxide initiator, from the following?
(1) \( \mathrm{C}_{6} \mathrm{H}_{5}^{\bullet}+\mathrm{C}_{2} \mathrm{H}_{4}=\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2}^{\bullet} \)
(2) \( \mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2}^{\bullet}+\mathrm{C}_{2} \mathrm{H}_{4}=\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}^{\bullet} \)
(3) \( \mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2} \cdot \mathrm{C}_{6} \mathrm{H}_{5}-\left(-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\right)_{\mathrm{n}}-\mathrm{CH}_{2} \bullet \)
(4) \( \mathrm{C}_{6} \mathrm{H}_{5}-\left(-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\right)_{\mathrm{n}}-\mathrm{CH}_{2} \bullet+\mathrm{C}_{6} \mathrm{H}_{5}-\left(-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\right)_{\mathrm{n}}- \)
\( \mathrm{CH}_{2}=\mathrm{C}_{6} \mathrm{H}_{5}-\left(-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\right)_{\mathrm{n}}-\mathrm{C}_{6} \mathrm{H}_{5} \)
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