Discussion
The geometry and the number of unpaired electrons in tetrakis(1-norbornyl)Co
respectively, are:
Answer: A
The complex is tetrahedral, with one unpaired electron.
Four 1-norbornyl groups make cobalt Co(IV), d5. The ligands are very bulky, which enforces a tetrahedral arrangement, and they are attached through a bridgehead carbon whose beta hydrogens cannot be eliminated (Bredt's rule forbids the bridgehead alkene), which is why this unusual alkyl survives.
Alkyl groups are strong σ-donors, and with a high oxidation state the tetrahedral splitting is large enough to give a low-spin configuration, e4t21: one unpaired electron. Five unpaired electrons would be the high-spin d5 case, and the square planar options ignore the steric demand of four such large groups.
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