Question

Which of the following biologically important coordination compounds has a magnesium central atom?

• A. Chlorophyll
• B. Haemoglobin
• C. Vitamin ${\text{B}}_{12}$
• D. Carboxypeptidase-A

Answer 1

The correct option is A Chlorophyll

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.