dmg (dimethyl glyoximato) is:

monodentate

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bidentate

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tridentate

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tetradentate

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Solution

The correct option is D bidentate
dimethyl glyoximato has four sites for donation, two lone pairs each from Nitrogen and Oxygen. However, due to resonance, the lone pair over nitrogen is unavailable for donation. Hence only the lone pairs present at Oxygen is responsible for donation and so dimethyl glyoximato is bidentate

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