4AB › Chemistry PYQ › CSIR-NET › June 2017 › Q23Q23 · CSIR-NET Chemistry, June 2017 Paper: CSIR-NET June 2017 · Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Bioinorganic Chemistry – General · 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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