In general, we can prove reversibility using isotopic species or using labelled species in the reaction but will this be applicable in this case?
Ian A Cade
To add to the previous answer - I would suggest 4-methyl-benzaldehyde would be suitable as the methyl protons would give a good clear NMR handle.
Run the benzoin condensation to completion, then add 4-methyl-benzaldehyde, and monitor the sample by 1H NMR. If you see additional methyl resonances, beyond that of the 4-methyl-benzaldehyde, it suggests that the reaction is reversible.
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