Which of the following is/are bidentate ligand?
1,2
1,4,5
2,3,5
2,3,4
As we have learnt,
Bidentate ligands are ligands with two donor atoms which can link with the central metal ion through two co-ordinate bonds. Some examples include ethylenediamine(en), oxalate(ox), etc.
1,2 are bidentate
3 is monodentate
4,5 are tridentate
Therefore, option (1) is correct.