In vitro reaction of an excess of O₂ with free heme B in aqueous medium the end product is · ABC26IN0896

Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Bioinorganic Chemistry – General · Exam: CSIR NET JUNE 2017 · Marks: 2 · Difficulty: Medium

In vitro reaction of an excess of $\mathrm{O}_2$ with free heme B in aqueous medium the end product is
(a)hematin
(b)$[\mathrm{O_2}\text{--Fe(III)-protoporphyrin-IX}]$
(c)heme $\mathrm{B(O_2)}$
(d)oxoferrylprotoporphyrin-IX cation radical
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Without the protein pocket, heme B + O₂ in water forms a peroxo-bridged dimer that collapses irreversibly to the Fe(III) μ-oxo dimer / hydroxo-Fe(III) species — hematin.

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