An equal chemical amount (0.10 mol) of each of the following organic compounds is added separately to 250 cm3 of water at 298 K.
Which compound produces the solution with the lowest pH?
CH3COOCH2CH3\text{CH}_3\text{COOCH}_2\text{CH}_3CH3COOCH2CH3
(CH3CO)2O(\text{CH}_3\text{CO})_2\text{O}(CH3CO)2O
CH3COCl\text{CH}_3\text{COCl}CH3COCl
CH3COOH\text{CH}_3\text{COOH}CH3COOH