In the transformation of oxyhemoglobin to deoxyhemoglobin

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$F e^{2 +}$ in the low spin state changes to $F e^{2 +}$ in the high spin state

Ionic radius of $F e^{2 +}$ increases during change of oxyhemoglobin to deoxyhemoglobin

There is no change in the colour of blood

Diamagnetic $F e^{2 +}$ changes to paramagnetic $F e^{2 +}$

answer is A, B, C.

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Detailed Solution

Since $O_{2}$ is strong ligand all $d^{6}$ electrons are paired in $t_{2 g}$ orbitals with $t_{2 g}^{6} e g^{0}$ configuration. But in deoxyhemoglobin as the strength of H2O ligand decreases the $F e^{2 +}$ ion changes from low spin $t_{2 g}^{6} e g^{0}$ to $t_{2 g}^{4} e g^{2}$ configuration. So diamagnetic $F e^{2 +}$ ion changes to paramagnetic $F e^{2 +}$ . Since in deoxyhemoglobin all the five d orbitals are filled with electrons, there will be some repulsion between orbitals and the size of $F e^{2 +}$ increases. Due to change from strong field to weak field the colour also changes.