Identify A and B in each of the following processes :
(i) `CH_(3)CH_(2) overset(NaCN) to A underset(Ni//H_(2)) overset("reduction") to B`
(ii) ` C_(6)H_(5)NH_(2)overset(NaNO_(2))toAunderset(OH^(-))overset(C_(6)H_(5)NH_(2)) to B`

Explanation

`(i) underset("Choroethane")(CH_(3)CH_(2)Cl) overset(NaCN)to underset((A))underset("propanenitrile")(CH_(3)CH_(2)C-=N)overset("reduction")tounderset(underset((B))("propan-1-amine"))(CH_(3)CH_(2)CH_(2)NH_(2))`
(ii)