Question

8.9 Consider the following competition between E2 elimination and E1 elimination. CH3 H3 solvent Br:Base: CH- ex H3C t-butoxide 73 27 "pyridine % #2-alkene % #4-alkene 10 90 a. (1 point) The alkene/alkene product ratio is the dependent variable for this study. What is the (independent) variable? b. (1 point) What is (are) the data trend(s)? C. (3 points) what do the data trends tell us about elimination mechanisms? Use arrows to show the preferred pathway for t-butoxide CH3 Use arrows to show the preferred pathway for pyridine Fill in the blanks: The strength of the base is the most important factor in determining the mechanism for elimination. mechanism bases favor the mechanism. bases favor the

Answer 1

Answer: (a) The alkene/ alkene product ratio is dependent variable for this study , this is because it depends on the strength of base used .

Independent variable is the base choosen , we can choose any base which can do elimination reaction and the production of base-H and Br^{​​​​​-} is also independent.

Part (b) and (c) is shown in the image attached:

Data tsend shews the % and A-aukene ermed 10 puduuad. nit, u- majot.pudu 냐 teticalay hrindered cidu キ So, Budtoids 오 CH maj to inDuaded the n ciclity -n -t, canbouderv,'wtǐX4 is ta.kon nidine to tum mere stelle aateone C. 2

From the mechanism shown in the (c) part , we can answer fill in the blanks :

The strength of base is the most important factor to determine mechanism of elimination reaction.

Strong base favours the E_{​​​​​​2} mechanism.

Weak base favours the E_{​​​​​​1} mechanism .