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)$\mathrm{1810 ~ cm}^{-\mathrm{1}}$
(b)$\mathrm{1770 ~ cm}^{-\mathrm{1}}$
(c)$\mathrm{1730 ~ cm}^{-\mathrm{1}}$
(d)$\mathrm{1690 ~ cm}^{-1}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
A saturated five-membered (γ-)lactone fused to cyclohexane absorbs near 1770 cm⁻¹ (b).
Study loop for Organic Spectroscopy