... and more crystals precipitated. Then, in ~0.1mL increments, an additional 0.3mL of Br2 solution is added and regardless of how long the flask was swirled, the bromine color persisted. Then, 2 drops of cyclohexene is added to the flask and the bromine color disappeared and became clear. The flask, after the addition of cyclohexene, became hot (exothermic) and was cooled in an ice-water bath. The white [had a tinge of yellow-brown color] crystalline solid is then isolated by vacuum filtration. The crystals were washed with 3 mL of cold [cooled in ice bath] cyclohexene. The crystals are then air dried for 2 days and a melting point analysis is conducted. The product isolated was white crystals (1.1136g, 74% yield) and gave a melting point range of 241-242 degrees Celsius. Tabulated Data: Compound Isolated mass mp range(º C) Description meso-1,2-dibromo01,2-diphenylethane 1.1136g 241-242 White crystals Yield Calculation: Product = meso-1,2-dibromo01,2-diphenylethane 0.8094g Stilbene |1 mol Stilbene| 1 mol Product | 334.06 g = ...

See this essay or coursework document in full right now