Chemistry - Coordination Chemistry Question with Solution | TestHub

(a) $\to$ (iv): Co³⁺ ($d^6$) undergoes pairing with H₂O acting as a strong field ligand, resulting in inner orbital $d^{2}s{p}^3$ hybridization.

(b) $\to$ (iii): Mn²⁺ ($d^5$) forms a high-spin complex with NH₃, containing $5$ unpaired electrons, making it paramagnetic.

(c) $\to$ (ii): The glycinate ion (gly⁻) is a well-known unsymmetrical bidentate ligand donating through N and O atoms.

(d) $\to$ (i): Ir³⁺ is a $5d^6$ ion where strong crystal field splitting causes complete pairing ($t_{2g}^6{e}_g^0$), giving a $CFSE=6\times (-0.4{\Delta }_0)=-2.4{\Delta }_0$.