The resonance Raman stretching frequency ($\nu_{\mathrm{O-O}}$ in $\mathrm{cm}^{-1}$) of $\mathrm{O}_{2}$, is 1580. The $\nu_{\mathrm{O-O}}$ for $\mathrm{O}_{2}$ in bound oxy-hemoglobin is close to
(a)1600
(b)1900
(c)800
(d)1100
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
In oxyhaemoglobin O₂ binds as a superoxide-like Fe(III)–O₂⁻ unit; ν(O–O) drops from 1580 (free O₂) to ≈1105 cm⁻¹.