The haemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight.The molecular weight of haemoglobin as 67,200.The numbers of iron atoms in each molecule of haemoglobin is (at wt of iron=56)

Question

$\begin{array}{1 1}(a)\;2&(b)\;3\\(c)\;4&(d)\;5\end{array}$