Q77 · CSIR NET Chemistry, December 2014
Paper: CSIR NET December 2014 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Combined Structure Elucidation · Marks: 2 · Difficulty: Hard
A compound with molecular formula $\mathrm{C}_{4} \mathrm{H}_{6} \mathrm{O}_{2}$ shows band at $1770 \mathrm{cm}^{-1}$ in IR spectrum and peaks at $178,68,28$ and 22 ppm in ${ }^{13} \mathrm{C} \mathrm{NMR}$ spectrum. The correct structure of the compound is
(a)
(b)
(c)
(d)
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
1770 cm⁻¹ γ-lactone; ¹³C 178 (C=O), 68 (OCH₂), 28 and 22 (CH₂). γ-Butyrolactone (c).
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