(A, B, C) The reaction of $Ni^{2+}$ with dimethylglyoxime $(DMG)$ in an ammoniacal (basic) medium produces a cherry-red precipitate of nickel$(II)$ di

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Each dimethylglyoximate unit forms a five-membered chelate ring with $Ni^{2+}$.

(A, B, C) The reaction of $Ni^{2+}$ with dimethylglyoxime $(DMG)$ in an ammoniacal (basic) medium produces a cherry-red precipitate of nickel$(II)$ dimethylglyoximate,$[Ni(DMG)_2]$.In this complex,two dimethylglyoximate units are bound to one $Ni^{2+}$ ion.The two dimethylglyoximate units are held together by strong intramolecular hydrogen bonding.Each dimethylglyoximate unit forms a five-membered chelate ring with the $Ni^{2+}$ ion through the nitrogen atoms of the oxime groups.Therefore,statements $A$,$B$,and $C$ are correct,while $D$ is incorrect because the chelate ring formed is five-membered,not six-membered.

Class 12 Chemistry Coordination Compounds Mix Examples-Co-ordination Chemistry

Medium

In basic medium,the amount of $Ni^{2+}$ in a solution can be estimated with the dimethylglyoxime reagent. The correct statement$(s)$ about the reaction and the product is (are):

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A
In an ammoniacal solution,$Ni^{2+}$ salts give a cherry-red precipitate of nickel$(II)$ dimethylglyoximate.
B
Two dimethylglyoximate units are bound to one $Ni^{2+}$.
C
In the complex,two dimethylglyoximate units are hydrogen bonded to each other.
D
Each dimethylglyoximate unit forms a five-membered chelate ring with $Ni^{2+}$.