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1

A very nice comprehensive set of IR absorption group frequencies were compiled seventy decades ago in the Journal of Optical Society of America by Colthup, 1950, 40, 397-400. It is freely available if you search "Spectra-structure correlations in the infra-red region" by Colthup in Google Scholar. You should memorize some standard frequencies of ...


2

In addition to James's answer, you can often tell primary amines and amides apart from OH groups because they will have two peaks in the 3300 - 3500 region. Your sample clearly shows this double peak, suggesting an NH2 group. Combined with the strong c=o absorbance at 1700 and you have an amide.


4

First, eliminate ethylene (ethene) because the strong absroption from 3200 to 3600 requires $-OH$ or $-NH$. Ethanol could be suggested by the 3200-3600, but lacks a strong absorption at 1050-1410, so eliminate ethanol. The strong peak at 1700 suggests acid or amide $C=O$. The lack of strong absorption between 2500-3000 eliminates carboxylic acid, so the ...


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