JEE Advanced Chemistry question

The oxygen carrying pigment, oxy-haemocyanin, containing two copper ions is diamagnetic, because

(A)The two copper ions are in +1 oxidation state
(B)One of the copper ions is in +1 oxidation state and the other is in +2 oxidation state
(C)There are strong anti-ferromagnetic interactions between the two copper ionsCorrect
(D)There are ferromagnetic interactions between the two copper ions

Answer: (C)

Solution

In deoxy-haemocyanin (before binding ), the two copper centres are indeed (, inherently diamagnetic). On binding , however, both coppers are oxidised to (, each with one unpaired electron) in oxy-haemocyanin, with the bound peroxide ion bridging the two copper centres; this

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Question ID VK-159736