The iron-free compound of haemoglobin is:

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(B) Haemoglobin is a conjugated protein consisting of a protein part called $Globin$ and a prosthetic group called $Haem$.$Haem$ is an iron-containing

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Haematin

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(B) Haemoglobin is a conjugated protein consisting of a protein part called $Globin$ and a prosthetic group called $Haem$.$Haem$ is an iron-containing porphyrin ring.When the iron $(Fe^{2+})$ is removed from the $Haem$ group,the remaining porphyrin structure is known as $Haematin$ (or more specifically,the iron-free derivative is often referred to as $Protoporphyrin$ $IX$).Among the given options,$Globin$ is the protein component,while $Haematin$ represents the iron-containing or iron-derived pigment structure associated with the breakdown of haemoglobin.

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