What experimental difficulty would you encounter if you had neglected to include a drying step before evaporating the ether solution of fluorene?

Answer 1

You have posted this question before. Perhaps the reason you haven't had a response is because we don't know how the compound was prepared; therefore, we don't know what other compounds may be in the fluorene/water/ether solution.

Answer 2

The main problem is that the product will be wet. This will lead to a recording of a higher yield than there should be. The product is a waxy solid and will be sticky if wet, consequently difficult to handle and indeed may not crystalise at all.
If the fluorene is to be used in a subsequent reaction, especially if a water sensitive base is to be used to remove one of the protons, then the reaction will fail or very much more base will be required to get the bright orange colour.