Page 17 Flashcards
What is represented by the peak of the energy diagram in an E2 reaction?
A: The transition state, where bonds are partially broken and formed.
In the transition state of an E2 reaction, which bonds are partially broken?
A: The C-H and C-Br bonds are partially broken.
Which bonds are partially formed in the E2 reaction transition state?
A: The O-H bond (with the base) and the π bond of the alkene are partially formed.
What does E_a represent on the energy diagram?
A: E_a represents the activation energy required for the reaction to proceed.
How does the leaving group behave in the transition state of an E2 reaction?
A: The leaving group bears a partial negative charge as it departs.
Why is the E2 reaction considered a concerted mechanism?
A: Because all bond-breaking and bond-forming processes occur in a single step without intermediates.
What is the energy difference between reactants and products on the diagram?
A: It represents the overall energy change ( \Delta H ) of the reaction.
What role does the base play in the transition state of an E2 reaction?
A: The base abstracts the proton from the β-carbon, forming a partial O-H bond.
Why is the transition state the highest point on the energy diagram?
A: It represents the point of maximum energy where old bonds are weakened, and new bonds are partially formed.
What products are formed at the end of the E2 reaction shown in the diagram?
A: An alkene (CH₂=CH₂), H₂O, and the leaving group (Br⁻).
