The frequency of O-H stretch occurs at ~ 3600 cm⁻¹. The O-D stretch frequency (in cm⁻¹) would be closest to

(b) 2600. Explanation: ν(O–D) ≈ 3600/√1.89 ≈ 2600 cm⁻¹ (b).

Q132 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Medium

The frequency of $\mathrm{O}-\mathrm{H}$ stretch occurs at $\sim 3600 \mathrm{cm}^{-1}$. The $\mathrm{O}-\mathrm{D}$ stretch frequency (in $\mathrm{cm}^{-1}$ ) would be closest to

(a)3000

(b)2600

(c)1800

(d)900

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

ν(O–D) ≈ 3600/√1.89 ≈ 2600 cm⁻¹ (b).

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