(A) steric hindrance.
(B) leaving group ability.
(C) resonance stabilization.
(D) electron-withdrawing character.
15 . Which conversion between carboxylic acid derivatives is NOT possible by a nucleophilic
reaction?(A) Carboxylic acid to ester
(B) Ester to carboxylic acid
(C) Anhydride to amide
(D) Ester to anhydride