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Complete the following reactions : (i)...

Complete the following reactions :
(i) `C_(6) H_(6) overset(CI_(2)//Fe)(to) X underset("Pyridine")overset(CuCN)(to) Y overset(H^(+), H_(2)O)(to)`
(ii) `C_(2)H_(4) overset(HBr)(to) X overset(aq. KOH)(to) Y overset(I_(2).NaOH)(to) Z`
(iii) `CH_(3)CH_(2)Br overset(AgCN)(to) A`

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