Ordering Rf of Aspirin with Polar Eluents

[cloveryeah]

Homework Statement

arrange the following eluents in an increasing order of Rf of aspirin

ethyl acetate, n-hexane, n-butanol, methanol

Homework Equations

The Attempt at a Solution

my order is n-hexane < n-butanol < ethyl acetate < methanol
but the order is wrong.
i am thinking: aspirin is polar, it will adhere onto the polar stationary phase.
with the increasing polarity of eluents, the Rf will increase as aspirin will dissolve more in the mobile phase.

So, what's wrong with my ans?

 

[Ygggdrasil]

You are correct that you should order the solvents with increasing polarity, but you have incorrectly ordered them by polarity (one hint would be to look up the dielectric constant of the different solvents).