The aqueous workup removes most if not all of the water soluble impurities including THF from the product mixture. Which of the following will be affected the most if the majority of THF is till present in the product mixture? a. Drying the product mixture with anhydrous sodium sulfate. b. The column chromatography. c. Rotary evaporation. d. Identification of N-succinimide in the product mixture with IR spectroscopy.