A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethylacelate (20:80), the sequence of obtained compounds is :

The increasing order to P_kb for the following compounds will be :

The IUPAC name for the following compound is :

The increasing order of the pK_b of the following compound is :