What Is Not a Reaction Commonly Associated with Cyanide Ion

What is not a reaction commonly associated with cyanide ion?

A) H⁺(aq) + CN^-(aq) → HCN(aq)
B) Ag⁺(aq) + CN^-(aq) → AgCN(s)
C) 4 Au(s) + 8 CN^-(aq) + O₂(g) + 2 H₂O(l) → 4 Au(CN) ₂^-(aq) + 4 OH^-(aq)
D) CN^-(aq) + H₂(g) → HCN(aq) + H^-(aq)