Which of the following species is not a pseudo halide?

C N O^{-}

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R C O O^{-}

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O C N^{-}

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N N N^{-}

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Solution

The correct option is C $R C O O^{-}$
There are some ions consisting of two or more electronegative atoms of which at least one is nitrogen that has properties similar to those of halide ions. These ions are called pseudohalide ions. $R C O O^{-}$ is not a pseudohlide ion. Remaing $C N O^{-}$ , $O C N^{-}$ and $N N N^{-}$ are pseudohlide ions.
Hence option B is correct.

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