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:**Title: Hydrogenation Reaction: Determining the Final Product**
**Objective:**
To identify the final product of a hydrogenation reaction using a palladium catalyst (Pd-C).
**Reaction Given:**
- Reactant: A molecule with a triple bond (alkyne), specifically a substituted alkyne.
- Catalysts: Hydrogen gas (H₂) and palladium on carbon (Pd-C).
**Problem Statement:**
*Select the final product of the following reaction:*
The image provides four options as potential products of the reaction:
1. **Option A:** A structure with a double bond positioned between a linear chain and a branching chain.
2. **Option B:** A completely saturated hydrocarbon (alkane) that lacks any double or triple bonds.
3. **Option C:** Another structure with a double bond but with different branching compared to Option A.
4. **Option D:** A structure with a Pd (palladium) marker attached, indicating that it may represent an intermediate or part of the catalytic process.
**Detailed Explanation:**
For the hydrogenation of alkynes:
- **Triple Bonds to Single Bonds:** Hydrogenation involves the addition of hydrogen (H₂) across the multiple bonds (double or triple bonds) in the presence of a catalyst.
- **Complete Hydrogenation:** In the presence of Pd-C, the reaction generally proceeds to complete hydrogenation, converting all triple and double bonds to single bonds (alkane).
Thus, evaluating each option with this knowledge:
- **Option A and C:** Show structures with remaining double bonds, indicating partial hydrogenation.
- **Option B:** Represents a fully hydrogenated molecule (an alkane) which matches the expectation of complete saturation of bonds.
- **Option D:** Shows a molecule with a Pd (palladium) marker, denoting that it might be an intermediate structure and not the final stable product.
**Conclusion:**
The correct answer is **Option B** since it represents the fully hydrogenated alkane structure, which is the expected end product when an alkyne undergoes complete hydrogenation using H₂ and a Pd-C catalyst.
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