Q1 Radical Halogenation Show the complete (initiation, propagation, and termination) stepwise mechanism, using arrow- pushing, for the following chemical transformation. CI + HCl H. hv
Q1 Radical Halogenation Show the complete (initiation, propagation, and termination) stepwise mechanism, using arrow- pushing, for the following chemical transformation. CI + HCl H. hv
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:**Radical Halogenation: Stepwise Mechanism**
This section explains the complete mechanism (initiation, propagation, and termination) using arrow-pushing for the radical halogenation of an alkane.
**Chemical Reaction:**
Starting Materials:
- An alkane (depicted with a hydrogen atom attached to a carbon)
- Chlorine molecule (Cl₂)
Reaction Conditions:
- Under the influence of light (hν), which initiates the reaction.
Products:
- Alkane with chlorine substituted for hydrogen
- Hydrogen chloride (HCl)
**Mechanism Steps:**
1. **Initiation:**
- Light (hν) causes the homolytic cleavage of the Cl₂ molecule, forming two chlorine radicals.
2. **Propagation:**
- The chlorine radical abstracts a hydrogen from the alkane, forming HCl and a carbon radical on the alkane.
- The carbon radical then reacts with another Cl₂ molecule, forming the chlorinated alkane and another Cl radical. This Cl radical can continue the chain process.
3. **Termination:**
- Radicals combine with each other in various ways to terminate the chain reaction:
- Two Cl radicals form Cl₂.
- A Cl radical and an alkane radical form chloroalkane.
- Two alkane radicals form a new C-C bond.
This mechanism highlights the free radical halogenation process, which is crucial for synthetic applications in organic chemistry.
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