Q73 · CSIR-NET Chemistry, June 2015

Paper: CSIR-NET June 2015 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: IR · Marks: 2 · Difficulty: Easy

Intense band generally observed for a carbonyl group in the IR spectrum is due to
(a)The force constant of CO bond is large
(b)The force constant of CO bond is small
(c)There is no change in dipole moment for CO bond stretching
(d)The dipole moment change due to CO bond stretching is large.
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
IR intensity depends on (∂μ/∂Q)²; the polar C=O bond changes its dipole strongly on stretching, so the band is intense.

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