Find the number of complex(es) which have at least one five member chelate ring formed by involving carbon atom(s), nitrogen atom(s), oxygen atom(s) and one central metal.

Question

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To find the number of complexes with at least one five-membered chelate ring containing C, N, and O atoms along with the metal, we examine the ligands:

$[C o (E D T A)]^{-}$ : EDTA is a hexadentate ligand that forms five-membered rings involving M-N-C-C-O atoms. (Matches)

$[C o (Gl y)_{3}]^{0}$ : Glycinate is a bidentate ligand ( $N H_{2} C H_{2} CO O^{-}$ ) forming a five-membered ring with M-N-C-C-O atoms. (Matches)

Other complexes: $[C o (e n)_{3}]^{3 +}$ , $[C o (bi p y)_{3}]^{3 +}$ , and $[C o (d i e n) (N H_{3})_{3}]^{3 +}$ involve only C and N (no oxygen in the ring), while $[C o (o x)_{3}]^{3 -}$ involves only C and O (no nitrogen in the ring).

Answer: 2 (Specifically $[C o (E D T A)]^{-}$ and $[C o (Gl y)_{3}]$ ).

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