Answer:

Electronic configuration and orbital contribution to magnetic moment

In tetrahedral geometry, the electronic configuration and orbital contribution to the magnetic moment can be determined based on the number of unpaired electrons in the d-orbitals.

Set of electronic configurations

The four given sets of electronic configurations are:

a) d³, d⁴, d8, d9
b) d¹, d6, d7, d9
c) d3, d4, d7, d9
d) d1, d3, d4, d9

Orbital contribution to magnetic moment

The orbital contribution to magnetic moment depends on the number of unpaired electrons in the d-orbitals. If there are unpaired electrons, then there will be an orbital contribution to the magnetic moment. If all the electrons are paired, then there will be no orbital contribution to the magnetic moment.

Analysis of the given sets

a) Set a includes d³, d⁴, d8, and d9. Among these, only d³ and d⁴ have unpaired electrons and hence show an orbital contribution to the magnetic moment.

b) Set b includes d¹, d6, d7, and d9. Among these, only d¹ and d7 have unpaired electrons and hence show an orbital contribution to the magnetic moment.

c) Set c includes d3, d4, d7, and d9. Among these, only d3 and d4 have unpaired electrons and hence show an orbital contribution to the magnetic moment.

d) Set d includes d1, d3, d4, and d9. Among these, only d1, d3, and d4 have unpaired electrons and hence show an orbital contribution to the magnetic moment.

Conclusion

Based on the analysis, the set of electronic configurations that will have orbital contribution to the magnetic moment are:

d1, d3, d4, and d9.