Which of the following is a pseudohalogen?

I F_{7}

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C N^{-}

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I C l_{2}

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I_{3}^{-}

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Solution

The correct option is B $C N^{-}$
Here $C N^{-}$ is a linear pseudo-halide. Pseudo halogens are the elements which are form from 2 or more p-block elements with a unit negative charge on them. here, the cyanide group is the combination of carbon and nitrogen with the unit negative charge on it.
Pseudo halogen forms covalent compounds similar to that of halogens, but pseudo halogens can polymerise, whereas halogens can't.

Hence, option c is correct.

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S F_{4}, P C l_{3} F_{2}, P C l_{2} F_{3}, {I_{3}}^{-}, B r F_{3}, {I C l_{2}}^{-}, X e F_{4}

I_{3}^{-}, H_{2} O, I C l_{2}^{-}, C_{2} H_{4}, C_{2} H_{2}, H_{3} O^{+}

Among the following, which qualifies as a pseudohalogen?

S O_{2}, C O_{2}, N_{2} O, O F_{2}, {I C l_{2}}^{-}, {I_{3}}^{-}, N O_{2}, {N O_{2}}^{-}, {N O_{2}}^{+}, {B F_{2}}^{-}, B e C l_{2}, {N_{3}}^{-}, H C N .

N H_{3}, H_{2} S, C O_{2}, I_{3}^{-}, X e F_{2}, B e C l_{2}, I C l_{2}^{+}, X e F_{4}, X e O_{4}, C_{3} O_{2}

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