Which of the following is a pseudohalide?

Options

A. `I_(2)^(-)`
B. ICI
C. `IF_(7)`
D. `CN^(-)`

Answer

D

Explanation

`CN^(-)` resemble `Cl^(-), Br^(-) and I^(-)` in the following respects i) It form HCN ii) The electron deficient species attack on nitrogen as well as carbon, as they have electron rich centre.