Consider the following statements for the oxygenation of hemocyanine:(A) Oxidation state of both copper atoms changes by two(B) It becomes intense blue from colorless(C) Dioxygen is reduced to $\mathrm{O_2^{2-}}$(D) The $\mu\text{-}\eta^{2}:\eta^{2}$ bond forms between each oxygen and copper atoms.The correct statements are:
(a)(A) and (C)
(b)(B) and (C)
(c)(A), (B) and (C)
(d)(B), (C) and (D)
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Deoxyhemocyanin [Cu(I)₂] binds O₂ as μ-η²:η²-peroxide, giving Cu(II)₂ (each Cu changes by one). The colourless protein turns intense blue from an O₂²⁻→Cu charge-transfer band. B, C and D (d).