Question
The blue complex formed on addition of $$conc.\,N{H_4}OH$$ solution to a $$C{u^{2 + }}$$ salt solution has the structure ?
A.
$${\left[ {Cu{{\left( {N{H_4}} \right)}_4}} \right]^{2 + }}$$
B.
$${\left[ {Cu{{\left( {N{H_3}} \right)}_2}} \right]^{2 + }}$$
C.
$${\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }}$$
D.
$${\left[ {Cu{{\left( {N{H_4}} \right)}_2}} \right]^{2 + }}$$
Answer :
$${\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }}$$
Solution :
$$C{u^{2 + }} + 4N{H_4}OH \to \mathop {{{\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]}^{2 + }}}\limits_{{\text{deep blue comp}}} + 4{H_2}O$$