The redox reaction among the following is :

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 refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :

Which of the following statements is correct ?