Explain the following :
(i) Low spin octahedral complexes of nickel are not known.
(ii) The `pi` - complexes are known for transition elememts only.
(iii) CO is a stroger ligand than `NH_(3)` for many metals.
A. Ferrocene
B. Zeises salt
C. Dibenzenechromimum exhibits optical activity ?
D. Grignard Reagent
