Question

Which of the following statement is true about \( \pi \)-acid ligands 

a) they are capable of accepting an appreciable amount of \( \pi \) electron density from the metal atom into \( \pi \) or \( \pi^{*} \) orbitals of their own

b) CO, NO, ferrocene, ethylene and cyclopentadienyl act as \( p \)-acid ligands

c) both \( a \) and \( b \) are correct

d) neither A or B is correct

Answer 1

π -acid ligands are capable of accepting an appreciable amount of π electron density from the metal atom into π* or σ* orbital( LUMO) of their own.

CO, No, ethylene and cyclopentadienyl act as \(P\hat t\)- acid ligand while ferrocene does not because it is a complex not a ligand.

Hence option (d) is right answer