The Substance Shown Below Is the Fe-Protoporphorin IX Found in Heme

question 73

Multiple Choice

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(I
• I) has six d electrons.
• C) Fe obeys the 18-electron rule.
• D) All of the above are correct for this substance.

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