Which of the following statements related to adding increasing amounts of ethyl

Question

Which of the following statements related to adding increasing amounts of ethyl acetate to toluene during column chromatography of 2 and 4 nitroaniline with silica gel are true.  Note that there may be more than one correct answer. Please Explain.

Water should be added to toluene instead of ethyl acetate because it is more polar, less toxic and cheaper.

Molecule A is ethyl acetate.


A mixture of ethyl acetate and toluene is LESS polar than toluene and therefore elutes the more polar 4-nitroaniline faster.  
A mixture of ethyl acetate and toluene is MORE polar than toluene and therefore elutes the more polar 2-nitroaniline faster.  
Molecule C is ethyl acetate.
A mixture of ethyl acetate and toluene is MORE polar than toluene and therefore elutes the more polar 4-nitroaniline faster.  
Increasing percentages of ethyl acetate in toluene are added instead of pure ethyl acetate to avoid cracking of the silica gel in the column.

Explanation / Answer

---------Molecule C is ethyl acetate.

---------A mixture of ethyl acetate and toluene is MORE polar than toluene and therefore elutes the more polar 2-nitroaniline faster.

-----------Increasing percentages of ethyl acetate in toluene are added instead of pure ethyl acetate to avoid cracking of the silica gel in the column.

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