Two different iron 2+ metal complexes were found in a sample of the earth's core taken in Greenland. One of the complexe

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Two different iron 2+ metal complexes were found in a sample of
the earth's core taken in Greenland. One of the complexes appears
red, while the other is yellow. Chemical analysis revealed the
following formulas:
Complex A formula:
[FeCl6]4-
Complex B formula:
[Fe(CO)6]2+
a. Name the two complexes:
Complex A:
Complex B:
b. Which complex has the largest octahedral splitting
energy?
c. Which complex would you expect to have the red color?
d. Fill in the d electrons for Fe2+ on the diagrams below.
Complex A electron diagram-
Complex B electron diagram-
e. Explain why the above electron diagrams are the same or
different.
Complex A
Complex B