Identify each compound from its spectral data.
a. Molecular formula: C3H5ClO2
IR: 3500–2500 cm−1, 1714 cm−1
1H NMR data: 2.87 (triplet, 2 H), 3.76 (triplet, 2 H), and 11.8 (singlet, 1 H) ppm
b. Molecular formula: C8H8O3
IR: 3500–2500 cm−1, 1688 cm−1
1H NMR data: 3.8 (singlet, 3 H), 7.0 (doublet, 2 H), 7.9 (doublet, 2 H), and 12.7 (singlet, 1 H) ppm
c. Molecular formula: C8H8O3
IR: 3500–2500 cm−1, 1710 cm−1
1H NMR data: 4.7 (singlet, 2 H), 6.9–7.3 (multiplet, 5 H), and 11.3 (singlet, 1 H) ppm
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