Why is it difficult to determine whether lipase is active in tube 5 [the one where you added vegetable oil, bile slats, lipase and a buffer with a pH of 2.0]

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.