Q29 · CSIR-NET Chemistry, December 2018

Paper: CSIR-NET December 2018 · Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Chemical Bonding – General · Marks: 2 · Difficulty: Hard

Arrange the following molecules in order of increasing fundamental vibrational frequencies
(a)$\mathrm{O}_{2}^{2-}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}<\mathrm{O}_{2}^{+}$
(b)$\mathrm{O}_{2}<\mathrm{O}_{2}^{+}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}^{2-}$
(c)$\mathrm{O}_{2}^{2-}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}^{+}<\mathrm{O}_{2}$
(d)$\mathrm{O}_{2}^{+}<\mathrm{O}_{2}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}^{2+}$
Answer
Answer: A ✓ checked by 4AB · confidence medium
Explanation
The O–O stretching frequency rises with bond order: O₂²⁻ (≈800) < O₂⁻ (≈1100) < O₂ (1580) < O₂⁺ (≈1870 cm⁻¹).

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