JEE Advanced Chemistry question

Which of the following complexes is not a chelate?

(A)Bis (dimethylglyoximato) nickel (II)
(B)Potassium ethylenediaminetetrathiocyanato chromate (III)
(C)Tetrammine carbonatocobalt (III) nitrateCorrect
(D)Trans-diglycinatoplatinum (II)

Answer: (C)

Solution

In tetraamminecarbonatocobalt(III) nitrate, [Co(NH_3)_4(CO_3)]NO_3, the four ligands are monodentate and, in the arrangement implied by this formula, the carbonate does not close a ring with the other coordinated ligands in the way a true chelate does — so no

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Question ID VK-160048