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Which is best known pseudohalide ?

The best known pseudohalide is CN-.This resembles Cl- , Br- and I- in the following respects:
(i) It forms an acid, HCN.
(ii) It can be oxidised to (CN)2 molecule.
(iii) It forms insoluble salts with Ag+, Pb2+ and Hg22+
(iv) It forms large number of complexes similar to halide complexes,

            e.g. [Cu (CN)4]2- and [CuCl4]2, [Co(CN)6]3- and [CoCl6]3-
(v) Inter-pseudohalogen compounds ClCN, BrCN and ICN can be formed.
(vi) AgCN is insoluble in water but soluble in ammonia like AgCl.


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