Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of $\mathrm{M}^{n^{+}}$ion are provided below; their $\lambda_{\max }$ values are marked as A , B...

The coordination numbers of Co and Al in $\left[\mathrm{Co}(\mathrm{Cl})(\mathrm{en})_2\right] \mathrm{Cl}$ and $\mathrm{K}_3\left[\mathrm{Al}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]$, respectively, are (en $=$ ethane -1 , 2-diamine)

The complex that has highest crystal field splitting energy ( $\Delta$ ), is

The species that can have a trans-isomer is : (en = ethane-1, 2-diamine, ox = oxalate)

In the following reaction

The metal d-orbitals that are directly facing the ligands in $\mathrm{K}_3\left[\mathrm{Co}(\mathrm{CN})_6\right]$ are

The one that will show optical activity is
(en = ethane-1,2-diamine)

The total number of coordination sites in ethylenediaminetetraacetate (EDTA ${ }^{4-}$ ) is

The values of the crystal field stabilization energies for a high spin $d^6$ metal ion in octahedral and tetrahedral fields, respectively, are

The magnetic moment of an octahedral homoleptic Mn(II) complex is 5.9 BM. The suitable ligand for this complex is