1. The problem statement, all variables and given/known data i) Is lactic acid,CH3CH(OH)COOH a stronger or weaker acid than propanoic acid (CH3CH2COOH) ii) Another question is does ketone reacts with phosphorus pentachloride PCl5? 2. Relevant equations 3. The attempt at a solution (i) I guess lactic acid is a stronger acid because the oxygen atom on the hydroxyl group is very electronegative thus increases the polarity of the -OH bond on the carboxyl group, so H+ are more easily released. (Please correct me if i am wrong) (ii) I can't find any relevant information from my text book and even on google, but I encountered this type of question from my exercise book.. Can anyone guide me?