All of the following compounds can react as acids. Without using a table of acidities, rank them in order of increasing acidity. Explain your ranking.
Among all the acids , ethanesulfonic acid (CH3CH2SO3H) is the strongest acid. Because in its resonating structure the -ve charge spread over three oxygen atoms. Greater the number of resonating structure stronger will be the acid.
If we will remove one proton , it will give ,
CH3CH2OH CH3CH2O- + H+
Its resonance structure (no resonating structure)
H3C - H2C-O- CH3-CH2 = O