Question

Haemoglobin is a complex compound of which metal ion?

• A. ${\text{Fe}}^{2+}$
• B. ${\text{Fe}}^{3+}$
• C. ${\text{Co}}^{2+}$
• D. ${\text{Co}}^{3+}$

Answer 1

The correct option is A ${\text{Fe}}^{2+}$

Name	Metal Involved	Function
Chlorophyll	$Mg$	Photosynthesis
Haemoglobin​	$Fe$	Carries oxygenated blood
Vitamin B12​ (Cyanocobalamin)​	$Co$	Anti-pernicious anaemia factor​
Carboxypeptidase A​ Carbonic anhydrase	$Zn$	Enzymes

Chlorophyll is the green pigment in plants, responsible for photosynthesis, is a coordination compound of Mg.

Haemoglobin is the red pigment of blood which acts as the oxygen carrier and it a coordination compound of iron(II).