Which acid of each pair shown here would you expect to be stronger?

CH3CO2H or CH2FCO2H


The +I effect of –CH3 group increases the electron density on the O-H bond. Therefore, the release of proton becomes difficult. On the other hand, the -I effect of F decreases the electron density on the O-H bond. Therefore, the proton can be released easily. Hence, CH2FCO2H is a stronger acid than CH3CO2H.


NOTE:A strong acid is an acid which dissociates completely releasing almost all of its protons in the solution.



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