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Hydrobenzoin is more polar than benzil. Benzil has a carbonyl group (C=O), which is polar due to the electronegativity difference between carbon and oxygen. However, hydrobenzoin has two hydroxyl groups (OH), which are even more polar than carbonyl groups due to the high electronegativity of oxygen and the presence of a lone pair of electrons on oxygen. This makes hydrobenzoin a more polar molecule. [Source: https://pubchem.ncbi.nlm.nih.gov/compound/Hydrobenzoin#:~:text=Hydrobenzoin%20is%20a%20white%20crystalline%20solid,-that%20is%20insoluble%20in&text=The%20compound%20is%20used%20as,to%20produce%20polymers%20and%20resins.]