Consider the following complex ions: A = [Mn(CN)6]3- B = [Fe(CN)6]3- C = [CoF6]3- D = [Co(C2O4)3]3- Identify the option that correctly represents the increasing order of the number of unpaired electrons in these complex ions.

Match List I with List II: List I (Complex): A. [Pt(NH3)2Cl2] B. [Co(en)3]3+ C. [Co(NH3)5NO2]Cl2 D. [Cr(H2O)6]Cl3 List II (Type of isomerism): I. Optical II. Solvate III. Geometrical IV. Linkage Choose the correct answer from the options given below:

Which one of the following is an ambidentate ligand?