slow Br fast a) Write the rate law for the reaction above. b) Draw curved arrows showing electron movement in each step, and label the step as nucleophilic attack, proton transfer, leaving group, or rearrangement. c) How would the reaction rate be affected if the iodide concentration were doubled? d) How would the reaction rate be affected if the 2-bromo-2-methylpentane concentration were doubled?
slow Br fast a) Write the rate law for the reaction above. b) Draw curved arrows showing electron movement in each step, and label the step as nucleophilic attack, proton transfer, leaving group, or rearrangement. c) How would the reaction rate be affected if the iodide concentration were doubled? d) How would the reaction rate be affected if the 2-bromo-2-methylpentane concentration were doubled?
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Reaction Explanation and Questions**
The image shows a two-step reaction mechanism involving 2-bromo-2-methylpentane and iodide ion (I⁻).
### Reaction Steps:
1. **First Step (slow):**
- 2-bromo-2-methylpentane undergoes dissociation, forming a carbocation and bromide ion (Br⁻).
- **Type of Step:** Leaving group departure.
2. **Second Step (fast):**
- The iodide ion (I⁻) attacks the carbocation, forming 2-iodo-2-methylpentane.
- **Type of Step:** Nucleophilic attack.
### Questions:
a) **Write the rate law for the reaction above.**
b) **Draw curved arrows showing electron movement in each step, and label the step as nucleophilic attack, proton transfer, leaving group, or rearrangement.**
c) **How would the reaction rate be affected if the iodide concentration were doubled?**
d) **How would the reaction rate be affected if the 2-bromo-2-methylpentane concentration were doubled?**
### Additional Information:
- The first step is the rate-determining step, as it is indicated to be slow.
- The reaction follows a classical SN1 mechanism.
### Graph/Diagram Explanation:
- There are structural formulas of reactants, intermediates, and products.
- Curved arrows indicating electron movement would typically originate from the lone pair of the iodide ion moving towards the carbocation, representing a nucleophilic attack.
**Instruction:** Utilize these elements to discuss reaction mechanisms, SN1 processes, and how changes in reactant concentrations affect the rate in a contextual learning setting.
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