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Which one of the following species is not a pseudohalide?

 
CNO-
RCOO-
OCN-
NNN-

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Pseudohalides are the univalent anions (or functional groups) which form hydracids with hydrogen and form insoluble salts with Ag(Silver) such as cyanides, cyanates, isocyanates, rhodanides (i.e. thiocyanates and isothiocyanates), selenocyanogens, tellurorhodanides and azides

NNN-