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Identify X, Y and Z in the following rea...

Identify `X, Y and Z` in the following reaction
(i). `C_(6)H_(6)overset(Cl_(2)//Fe)toXunderset("Pyridine")overset(CuCN)toYoverset("Hydrolysis")toZ`
(ii). `C_(6)H_(5)NH_(2)overset(NaNO_(2)//HCl)toXoverset(CuBr)toYunderset("623K/Pressure")overset(NaOH)toZ`.

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(i). `C_(6)H_(6)overset(Cl_(2)//Fe)tounderset(X)(C_(6)H_(5)Cl)underset("Pyridine")overset(CuCN)tounderset(Y)(C_(6)H_(5)CN)overset("Hydrolysis")tounderset(Z)(C_(6)H_(5)COOH)`
(ii). `C_(6)H_(5)NH_(2)overset(NaNO_(2)//HCl)tounderset(X)(C_(6)H_(5)N_(2)Cl)overset(CuBr)tounderset(Y)(C_(6)H_(5)Br)underset("623K/Pressure")overset(NaOH)tounderset(Z)(C_(6)H_(5)OH)`
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