Column chromatography is a method used to separate a single compound from a mixture of compounds.
⇒ Here we take a mixture of 3 compounds (A) benzanilide (B) aniline (C) acetophenone.
⇒ To separate the mixture here we are using a mixture of two solvents. hexane and ethyl acetate in the ratio 20: 80
⇒ hexane is a non-polar solvent having
20% composition.
⇒ ethyl acetate
H3C−CH2−O−−CH3 is a polar solvent having 80 % composition.
⇒ Means nonpolar compound present in a less quality as compared to polar solvent.
⇒ Hence more polar compound present in a mixture will separate out first with the polar solvent hence.
⇒ Acetophenone is more polar among (A), (B) & (C) hence it will separate first and after that.
⇒ Benzanilide is more polar than aniline hence A will elute out after that.
⇒ Hence the answer should be (C), (A) & (B)
Refer below image