The question asks which of the compounds is the MOST basic? Primary alcohols, esters, secondary amines, tertiary thiols The answer is secondary amines. For the answer explanation in the back they state that esters have no lone pair of electrons that can be readily donated to a proton. Can any one explain this to me because I thought esters are able to donate electrons through the carbonyl carbon. Also, what is the reasoning why amines are most basic as compared to the rest of the compounds? Thanks!