The ligand that can't form chelates is: (b) Ambidentate ligandExplanation:
(a) Didentate ligand - A didentate ligand is a ligand that can form two coordinate bonds with a metal ion. Since it can form multiple bonds, it is capable of forming chelates.
(b) Ambidentate ligand - An ambidentate ligand is a ligand that can bond to a metal ion through different atoms or groups. For example, thiocyanate (NCS-) and nitro (NO2-) are ambidentate ligands. However, even though they can form multiple bonds, they do not form chelates because they lack the necessary groups to create a cyclic structure.
(c) Tetradentate ligand - A tetradentate ligand is a ligand that can form four coordinate bonds with a metal ion, and it is capable of forming chelates with the metal ion.
(d) Flexidentate ligand - There is no specific term known as "flexidentate" ligand in coordination chemistry. It is possible that this term might refer to ligands that are capable of adopting different coordination numbers based on the metal ion's size and preferences. In any case, if the ligand can form multiple bonds with the metal ion, it has the potential to form chelates. |
