For any impurities found in your NMR sample, suggest at least one method that could be used to remove each impurity. 3. Re crystl getting rid lizing woud help to mcke i+ more pure, a lot of the in pr ties Benzene is a common side product isolated from Grignard reactions that employ phenyl magnesium halides like the Grignard reagent used in this experiment. Provide a reaction equation and brief explanatio of how benzene could have formed in this reaction. 4.