Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given.
| Column I (Compound) | Column II (IUPAC Name) |
| (i) [Ni(CO)4] | (a) tetrachloridoferrate (II) |
| (ii) [Ni(CN)4]2- | (b) tetramminecopper(II) |
| (iii) [Cu(NH3)4]2+ | (c) tetracyanidonickelate(II) |
| (iv) [FeCl4]2- | (d) tetracarbonylnickel(0) |
Answer & explanation
Correct answer: option 2
The correct answer is option 2. (i)-(d), (ii)-(c), (iii)-(b), (iv)-(a).
| Column I (Compound) | Column II (IUPAC Name) |
| (i) [Ni(CO)4] | (d) tetracarbonylnickel(0) |
| (ii) [Ni(CN)4]2- | (c) tetracyanidonickelate(II) |
| (iii) [Cu(NH3)4]2+ | (b) tetramminecopper(II) |
| (iv) [FeCl4]2- | (a) tetrachloridoferrate (II) |
Let us break down the reasoning for each compound and its corresponding IUPAC name:
1. \([Ni(CO)_4]\):
The compound consists of a nickel atom surrounded by four carbon monoxide \((CO)\) ligands. The IUPAC naming convention for metal carbonyl complexes uses the prefix "carbonyl" for \(CO\) ligands, and "tetra-" for four ligands. The oxidation state of nickel in this compound is \(0\) (neutral complex). Hence, the name is tetracarbonylnickel(0).
2. \([Ni(CN)_4]^{2-}\):
The compound consists of a nickel atom surrounded by four cyanide \((CN)\) ligands. The IUPAC naming convention for complexes with cyanide uses the prefix "cyanido". The prefix "tetra-" is used for four ligands. The overall charge on the complex is \(-2\), and the oxidation state of nickel here is \(+2\). Hence, the name is tetracyanidonickelate(II).
3. \([Cu(NH_3)_4]^{2+}\):
The compound consists of a copper atom surrounded by four ammonia \((NH_3)\) ligands. The IUPAC naming convention for ammonia ligands uses the prefix "ammine". The prefix "tetra-" is used for four ligands. The overall charge on the complex is \(+2\), and the oxidation state of copper is \(+2\). Hence, the name is tetramminecopper(II).
4. \([FeCl_4]^{2-}\):
The compound consists of an iron atom surrounded by four chloride \((Cl^-)\) ligands. The IUPAC naming convention for chloride ligands uses the prefix "chlorido". The prefix "tetra-" is used for four ligands. The overall charge on the complex is \(-2\), and the oxidation state of iron is \(+2\). Hence, the name is tetrachloridoferrate(II).
Therefore, the correct matching is: (i)-(d), (ii)-(c), (iii)-(b), (iv)-(a).