The proton affinities of acetone, diethylketone, and benzophenone are 812.0, 836.0, and 882.3 kJ/mol, respectively. Rationalize the ranking of these values.
a) Acetone < Diethylketone < Benzophenone
b) Acetone < Benzophenone < Diethylketone
c) Diethylketone < Acetone < Benzophenone
d) Benzophenone < Acetone < Diethylketone
