Question

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

Answer 1

Correct Answer - B
`CN^(-)` is strongest field ligand. Thus spectrochemical series order is:
`I^(-)ltBr^(-)ltCl^(-)ltF^(-)lt[C_2O_4]^(2-)ltH_2OltpyltNH_3ltenltNO_2^(-)ltCN^(-)ltCO`.