Which of the following compounds will show absorptions at 1640 cm^-¹,2950 cm^-¹and 3050 cm^-¹ on the IR spectrum?

Name: Which of the following compounds will show absorptions at 1640 cm - 1 ,2950 cm - 1 and 3050 cm - 1 on the IR spectrum?
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Question

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Compound III contains both an ester (1640 cm-1) and a C-H stretch (2950 and 3050 cm-1), which are the characteristic absorptions for the given wavelengths. None of the other compounds contain both of these functional groups.

Which of the Following Compounds Will Show Absorptions at 1640