TPR Orgo Question

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QuentinT88

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Here is a question that I'm trying to clarify:

The Rf vale of Compound 3 is 0.7 when eluted with 20% ethyl acetate in hexanes. Which of the following is most likely the Rf value for Compound 3 eluted with straight hexanes?

(A) 0.2
(B) 0.7
(C ) 0.8
(D) Cant be determined

I thought that since hexanes are very non-polar compared to ethyl acetate, this would cause the Rf value to increase? This is going with the logic that Rf for polar objects are lower, and Rf for non-polar objects are higher, assuming the stationary phase is also polar.

Could someone help with this question? Thx!

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