Which of the following is the correct IUPAC name of the complex [Ni(PPh\(_3\))\(_3\)(H\(_2\)O)\(_3\)]Cl\(_2\)?

Question

A compound 'X' absorbs 2 moles of hydrogen and 'X' upon oxidation with KMnO4 - H⁺ gives the following products:

The total number of \(\sigma\) bonds present in the compound 'X' is ----.

Answer 1

To determine the correct IUPAC name for the complex \([Ni(PPh_3)_3(H_2O)_3]Cl_2\), we need to consider the rules for naming coordination complexes:

Identify the Ligands and their Order: The complex consists of ligands phosphine (represented as \(PPh_3\), which is triphenylphosphine) and water (\(H_2O\), called aqua in coordination chemistry). The IUPAC naming convention dictates that we list ligands alphabetically in their name. Thus, "aqua" comes before "triphenylphosphine" alphabetically.
Determine the Number of Each Type of Ligand: The complex contains three water molecules and three triphenylphosphine ligands. In IUPAC naming, we use the prefixes "tri-" to indicate three of a particular ligand.
Identify the Central Metal and Its Oxidation State: The central metal is Nickel (Ni). To determine the oxidation state of Nickel, note the charge on the complex as a whole, which is balanced by two chloride ions \((Cl^-)\). The overall charge of these two chlorides is -2. Because the complex is neutral in charge, the charge on the complex ion \([Ni(PPh_3)_3(H_2O)_3]^{2+}\) must be +2. The ligands (aqua and triphenylphosphine) are neutral, contributing 0 charge. Hence, the oxidation state of Nickel is +2.
Combining into the IUPAC Name: Putting all these components together gives us the name: Triaquatris(triphenylphosphine)nickel(II) chloride. This name is consistent with the conventional IUPAC rules for naming coordination complexes.

Therefore, the correct IUPAC name of the complex \([Ni(PPh_3)_3(H_2O)_3]Cl_2\) is Triaquatris(triphenylphosphine)nickel(II) chloride.

Justification of Options:

The option "Tris(triphenylphosphine)triaquanickel(II) chloride" misorders the ligands alphabetically.
The option "Triaquatris(triphenylphosphine)nickelate(II) chloride" incorrectly uses "nickelate," suggesting an anionic complex, which is not the case here.
The option "Triaquatris(triphenylphosphine)nickel(III) chloride" incorrectly states the oxidation state of Nickel as +3, when it is actually +2.

Answer 2

To determine the correct IUPAC name for the complex \([Ni(PPh_3)_3(H_2O)_3]Cl_2\), we need to consider the rules for naming coordination complexes:

Identify the Ligands and their Order: The complex consists of ligands phosphine (represented as \(PPh_3\), which is triphenylphosphine) and water (\(H_2O\), called aqua in coordination chemistry). The IUPAC naming convention dictates that we list ligands alphabetically in their name. Thus, "aqua" comes before "triphenylphosphine" alphabetically.
Determine the Number of Each Type of Ligand: The complex contains three water molecules and three triphenylphosphine ligands. In IUPAC naming, we use the prefixes "tri-" to indicate three of a particular ligand.
Identify the Central Metal and Its Oxidation State: The central metal is Nickel (Ni). To determine the oxidation state of Nickel, note the charge on the complex as a whole, which is balanced by two chloride ions \((Cl^-)\). The overall charge of these two chlorides is -2. Because the complex is neutral in charge, the charge on the complex ion \([Ni(PPh_3)_3(H_2O)_3]^{2+}\) must be +2. The ligands (aqua and triphenylphosphine) are neutral, contributing 0 charge. Hence, the oxidation state of Nickel is +2.
Combining into the IUPAC Name: Putting all these components together gives us the name: Triaquatris(triphenylphosphine)nickel(II) chloride. This name is consistent with the conventional IUPAC rules for naming coordination complexes.

Therefore, the correct IUPAC name of the complex \([Ni(PPh_3)_3(H_2O)_3]Cl_2\) is Triaquatris(triphenylphosphine)nickel(II) chloride.

Justification of Options:

The option "Tris(triphenylphosphine)triaquanickel(II) chloride" misorders the ligands alphabetically.
The option "Triaquatris(triphenylphosphine)nickelate(II) chloride" incorrectly uses "nickelate," suggesting an anionic complex, which is not the case here.
The option "Triaquatris(triphenylphosphine)nickel(III) chloride" incorrectly states the oxidation state of Nickel as +3, when it is actually +2.

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