Among the following which are ambidentate ligands? (i) - NO (ii) - NO (iii) EDTA 4– (iv) C₂O₄ 2– (v) SCN –

Ambidentate ligands are those which have 2 or more donor atoms but only one donor atom is bonded to the central metal atom during complex formation. Here, in the given question only - 2 NO and - SCN act as ambidentate ligands. In - 2 NO , both N and O can donate electrons to form complexes. When central metal atom is linked to N, 2 M-NO is formed and with O, M-ONO is formed. In SCN⁻, S and N are the 2 donor atoms forming M- SCN and M-NCS accordingly. Hence, option (d) is the correct answer