please answer all

. Answer the following with regard to Figure 5 which shows a base induced dehydrohalogenation reaction forming alkene products by an E2 mechanism. Draw the structure of all possible alkene products from elimination of HBr from the alkylbromide (4) by reaction with sodium ethoxide. Classify each of your suggested alkene products as mono-, di-, tri, or tetrasubstituted. Indicate which of your predicted alkene structures you expect to be the major product and account for your choice. Using curly arrow notation, draw a mechanism for the reaction leading to the structure you propose as the major product. Br + NaOET Alkene Products (4) Figure 5