Identify this substance!
IR spectrum
Mass spectrum
NMR spectrum
IR: $C=O$ band, probably $C-O$ ester or carboxylic acid, the peak at 2964 is not large enough for $OH$ of a carboxlic acid. Mass: $C_2H_5C=O^+$, $CH_3OC=O^+$, $C_2H_5^+$, $CH_3^+$ NMR : - singulet: H atoms non coupled, - quadruplet: 3 neighbouring H atoms, - triplet: 2 neighbouring H atoms! It's methyl propanoate $C_2H_5COOCH_3$