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1 ) Predict whether the benzoin condensation would work with 4-tolualdehyde, 4- trifluoromethylbenzaldehyde, and 4-N ethylaminobenzaldehyde. Draw the structure of any products that are formed. 2 ) Draw the complete structure of thiamine hydrochloride and use an arrow pushing mechanism to show its acid-base reaction with hydroxide ion. 3 ) How might the presence of benzoic acid (a) affect the pH of the reaction and (b) affect the crystallization of benzoin at the end?

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