The resonance Raman stretching frequency ( $\nu$ o-o. in $\mathrm{cm^{-1}}$ ) of $\mathrm{O_2}$, is 1580. The $\nu$ 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
O₂ in oxyhaemoglobin is bound as superoxide (Fe(III)–O₂⁻), ν(O–O) ≈ 1105 cm⁻¹ — close to 1100 (d).