Question

Which of the following is the strongest field ligand?
A. (a) `CN^-`
B. (b) `NO_2^-`
C. (c) `NH_3`
D. (d) `en`

Answer 1

Correct Answer - A
Increasing order of strength of ligands
`I^(-)ltBr^(-)ltS^(2-)ltSCN^(-) lt Cl^(-)ltN^(3-)ltF^(-)ltOH^(-)ltEtOHltC_2O_4^(2-)ltH_2OltNCS^(-)~H^(-)ltEDTAltNH_3lten ("ethylene diamine") lt"dipyridy" gt "ortho phenanthroline" ~SO_3^(2-)ltNO_2^(-)ltCN^(-)ltCO^(-)`
(Strongest ligands)