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The ligand called pi-acid is...

The ligand called `pi`-acid is

A

Co

B

`NH_(3)`

C

`C_(2)O_(4)^(-)`

D

ethylene diamine

Text Solution

Verified by Experts

The correct Answer is:
A
Ligands like `CO, CN^(-)` and `NO^(+)` have empty `pi`-orbitals which can overlap with the metal `t_(2g)` orbitals forming `pi`-bonds. This is called back bonding. As they accept electron pairs from `t_(2g)` orbitals of the metal, they are called `pi`-acids or `pi`-acceptors.
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