Dimethyl glyoxime is an example of a

bidentate ligand

The correct answer is option 2. bidentate ligand.

Dimethyl glyoxime (dmg) is a bidentate ligand. It has two donor atoms, which are the two nitrogen atoms. These two nitrogen atoms can donate electrons to a central metal atom, forming a coordination complex.

A monodentate ligand is a ligand that can donate only one electron to a central metal atom. A tridentate ligand is a ligand that can donate three electrons to a central metal atom. A hexadentate ligand is a ligand that can donate six electrons to a central metal atom.