Question

how many ligands of haemoglobin ​

Answer 1

Answer:

Hemoglobin works almost exactly the same way except that where myoglobin has only one iron-containing protein subunit, hemoglobin has four. When one of hemoglobin's four irons binds an O2 molecule, the other three protein subunits' iron atoms can bind O2 more easily.

Answer 2

Answer:

$\huge\underline\orange{\mathcal Answer}$

Haemoglobin as ligands around  d electrons end up as 2 pairs