Which one of the following is a pseudohalide?

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(A) Pseudohalide ions are monovalent negative ions composed of two or more electronegative atoms that exhibit chemical properties similar to those of

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$CN^{-}$

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(A) Pseudohalide ions are monovalent negative ions composed of two or more electronegative atoms that exhibit chemical properties similar to those of halide ions $(X^-)$. These ions can form dimeric molecules known as pseudohalogens,which behave similarly to halogens $(X_2)$. Among the given options,the cyanide ion $(CN^-)$ is a well-known pseudohalide,and its corresponding pseudohalogen is cyanogen $(CN)_2$. PseudohalidePseudohalogen$CN^-$ (Cyanide)$(CN)_2$ (Cyanogen)$SCN^-$ (Thiocyanate)$(SCN)_2$ (Thiocyanogen)

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