Find the maximum number of ligands which are σ -donor as well as π -acid ligand also, from the following − CN , F − , CO , OH − , O 2 − , NO + , NH 2 − , PF 3 , PR 3

Question

Find the maximum number of ligands which are σ -donor as well as π -acid ligand also, from the following − CN , F − , CO , OH − , O 2 − , NO + , NH 2 − , PF 3 ​ , PR 3 ​

TestHub · Accepted Answer

The maximum number of ligands that act as both $σ$ -donors and $π$ -acid ( $π$ -acceptor) ligands is 5.

Definition: $π$ -acid ligands donate a lone pair via a $σ$ -bond and simultaneously accept electron density from the metal's d-orbitals into their empty $π^{*}$ or vacant d-orbitals.

$π$ -acid ligands from the list: CN⁻, CO, NO⁺, PF₃, and PR₃.

Non- $π$ -acid ligands: F⁻, OH⁻, O²⁻, and NH₂⁻ act as $π$ -donors rather than $π$ -acceptors.

Chemistry - Coordination Chemistry Question with Solution | TestHub

Doubts & Discussion

JEE Advanced 2027 (Class 12+)