The substance shown below is the Fe-protoporphorin IX found in heme which is involved in oxygen transport in the blood. 
Which of the following correctly describes this substance?
A) There are four coordinate covalent bonds in the structure.
B) Fe(II) has six d electrons.
C) Fe obeys the 18-electron rule.
D) All of the above are correct for this substance.
Correct Answer:
Verified
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