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 ∝ 1/√μ; μ(OD)/μ(OH) ≈ 1.89, so ν(O–D) ≈ 3600/1.37 ≈ 2630 cm⁻¹ (b).

Q20 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: IR · Marks: 2 · Difficulty: Medium

The frequency of O-H stretch occurs at $3600\,\mathrm{cm}^{-1}$. The O-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 ∝ 1/√μ; μ(OD)/μ(OH) ≈ 1.89, so ν(O–D) ≈ 3600/1.37 ≈ 2630 cm⁻¹ (b).

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