Old test LQ3

Question 1

Which of the following statements about an E1 mechanism is not true?

a. It is a two-step process and has the same first step as an SN1 mechanism
b. It involves the formation of a carbocation from eliminating a good leaving group
c. The loss of a proton by the carbocation is a slow step
d. A common competing reaction is rearrangement of a less stable carbocation to a more stable carbocation

Answer 1

c. The loss of a proton by the carbocation is a slow step

Question 2

Which of the following statements about the mechanism of an E2 reaction is not true?
a. It exhibits first-order kinetics
b. It is fastest with tertiary halides
c. All bonds are broken and formed in a single step
d. A better leaving group should make a faster reaction

Answer 2

a. It exhibits first-order kinetics

Question 3

Which of the following statements about the mechanism of an E2 reaction is true?
a. Entropy favors the reactants of an E2 reaction
b. The reaction is not concerted
c. All bonds are broke and formed in multiple steps
d. Entropy favors the products of an E2 reactions

Answer 3

d. Entropy favors the products of an E2 reactions

Question 4

What is the major elimination in the reaction of 1-bromobutane with potassium tert-butoxide in tert-butanol?

Answer 4

cis-2-butene