Analyze the attached HNMR spectra, please help identify the important signals and explain their significance. what each important signal represents.  thanks in advance. (experiment- Synthesis of Benzoin via Thiamine-Catalyzed Benzoin Condensation)

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.