A compound displays the following spectral data. The correct structure of the compound is IR: 1690 ~ cm ⁻¹. ¹ H NMR: δ 2.5(s, 3H), 3.8(s, 3H), 6. 9(d, J=8Hz, 2H), 7. 8(d, J=8 ~ H z, 2H) ~ p p m ¹³ C NMR: δ 197,165,130,129,114,56,26 ppm

Q50 · CSIR-NET Chemistry, June 2016

Paper: CSIR-NET June 2016 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Combined Structure Elucidation · Marks: 2 · Difficulty: Hard

A compound displays the following spectral data. The correct structure of the compound is IR: $\mathrm{1690 ~ cm}{ }^{-\mathrm{1}}$. ${ }^{\mathrm{1}} \mathrm{H}$ NMR: $\delta 2.5(\mathrm{s}, \mathrm{3H}), 3.8(\mathrm{s}, \mathrm{3H}), \mathrm{6 . 9}(\mathrm{d}, \mathrm{J}=\mathrm{8Hz}, \mathrm{2H}), \mathrm{7 . 8}(\mathrm{d}, \mathrm{J}=\mathrm{8} ~ H z, \mathrm{2H}) ~ p p m { }^{13} \mathrm{C}$ NMR: $\delta 197,165,130,129,114,56,26 \mathrm{ppm}$

(a)