Q92 · CSIR NET Chemistry, June 2011
Paper: CSIR NET June 2011 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: IR · Marks: 2 · Difficulty: Hard
The major compound X formed in the following reaction exhibited a strong absorption at $\nu_{\mathrm{max}} = 1765\ \mathrm{cm^{-1}}$ in the IR spectrum. The structure of X is:
(a)
(b)
(c)
(d)
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
ν(C=O) 1765 cm⁻¹ is typical of a γ-lactone (five-membered ring strain), so X is 5-phenyl-dihydrofuran-2-one (d).
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