$ \begin{array}{1 1}(a)\;(1)NaNO_2/HCl,(2)CuCN,(3)LiAlH_4&(b)\;(1)NaNO_2,(2)CuCl,(3)H_2/PCl\\(c)\;(1)NaNO_2/HCl,(2)CuBr,(3)LiAlH_4&(d)\;(1)NaNO_2/HCl,(2)CuCN,(3)H_3O^{\oplus}\end{array}$
