Question

The theory that can completely/properly explain the nature of bonding in [Ni(CO)₄] is : 

(1) Werner's theory 

(2) Crystal field theory 

(3) Valence bond theory 

(4) Molecular orbital theory

Answer 1

Answer is (4) Molecular orbital theory

In complex [Ni(CO)₄] decrease in Ni–C bond length and increase in C–O bond length as well as it's magnetic property is explained by MOT.

Answer 2

Answer is (4) Molecular orbital theory.