Q78 · CSIR NET Chemistry, December 2013
Paper: CSIR NET December 2013 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: NMR 1H · Marks: 2 · Difficulty: Medium
In the IR spectrum, carbonyl absorption band for the following compound appears at 
(a)$1810\ \mathrm{cm^{-1}}$
(b)$1770\ \mathrm{cm^{-1}}$
(c)$1730\ \mathrm{cm^{-1}}$
(d)$1690\ \mathrm{cm^{-1}}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
A saturated five-membered (γ-)lactone fused to cyclohexane absorbs near 1770 cm⁻¹ (b).
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