On the basis of crystal field theory, electronic configuration of a low spin d ^4 complex is:

Step-by-step solution

In an octahedral crystal field, the d-orbitals split into two sets: the lower energy t_ 2g set and the higher energy e_g set. For a d^4 metal ion in a low spin complex, the crystal field splitting energy _o is greater than the pairing energy P . According to the Aufbau principle and Hund's rule, electrons fill the lower energy t_ 2g orbitals first. Since the complex is low spin, pairing occurs in the t_ 2g orbitals before any electrons occupy the e_g orbitals. For a d^4 configuration, the first three electrons occu