Rate-determining step and reaction mechanisms Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. A reaction has rate = k[A][B]. Which slow step is consistent with this?
- A. 2A → X
- B. A + B → X
- C. A + 2B → X
- D. B → X
2. In the acid-catalysed iodination of propanone, iodine is zero order. What does this show?
- A. Iodine is a catalyst
- B. Iodine is in the rate-determining step
- C. Iodine reacts in a fast step after the rate-determining step
- D. Iodine does not react at all
3. A tertiary halogenoalkane is hydrolysed with rate = k[RBr]. What is the mechanism?
- A. SN2
- B. SN1
- C. Free-radical substitution
- D. Elimination only
4. The mechanism of a reaction is: step 1 (slow) A + B → C + D; step 2 (fast) C + B → E. What is the overall equation?
- A. A + 2B → D + E
- B. A + B → E
- C. A + B → C + D
- D. A + 2B → C + E
5. Which statement about the SN2 mechanism of a primary halogenoalkane is correct?
- A. It has a carbocation intermediate
- B. It occurs in two steps
- C. The nucleophile attacks from the side opposite the halogen
- D. It is zero order in the nucleophile