What are the differences between ketones and esters in terms of their chemical structures and reactivity?

Ketones and esters are both organic compounds with different chemical structures and reactivity. Ketones have a carbonyl group (CO) bonded to two carbon atoms, while esters have a carbonyl group bonded to an oxygen atom and a carbon atom. In terms of reactivity, ketones are more reactive than esters due to the presence of two alkyl groups attached to the carbonyl carbon, which makes them more susceptible to nucleophilic attack. Esters, on the other hand, are less reactive because the alkyl group attached to the carbonyl carbon is less electron-donating.