A chromatography column, packed with silica gel as stationary phase,

Question:

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: ethyl acetate $(20: 80)$, the sequence of obtained compounds is:

  1. (B), (C) and (A)

  2. (B), (A) and (C)

  3. (C), (A) and (B)

  4. (A), (B) and (C)


Correct Option: , 3

Solution:

Compounds which are able to form strong $\mathrm{H}$-bond with the stationary phase (silica gel) will come last with the mobile phase.

H-bonding order:

$\therefore$ Sequence of obtained compounds is $(\mathrm{C}, \mathrm{A}, \mathrm{B})$

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