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Which step is chain termination step in the mechanism?
(i) \( \mathrm{Cl}_{2} \stackrel{h v}{\longrightarrow} \mathrm{Cl}^{\bullet}+\mathrm{Cl}^{\bullet} \)
(ii) \( \mathrm{Cl}^{\bullet}+\mathrm{CH}_{4} \longrightarrow \stackrel{\bullet}{\mathrm{C}}{ }_{3}+\mathrm{HCl} \)
(iii) \( \stackrel{\circ}{C}_{3}+\mathrm{Cl}_{2} \longrightarrow \mathrm{CH}_{3} \mathrm{Cl}+\mathrm{Cl}^{\bullet} \)
(iv) \( \mathrm{Cl}^{\bullet}+\stackrel{\bullet}{\mathrm{CH}_{3}} \longrightarrow \mathrm{CH}_{3} \mathrm{Cl} \)
(A) (i)
(B) (ii)
(C) (iii)
(D) (iv)
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