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:### Organic Chemistry Reaction with Lindlar's Catalyst
**Problem Statement**:
For the reaction shown, select the expected major organic product.
**Reaction Scheme**:
A chemical compound with a structure incorporating a triple bond (indicated by ≡) is treated with hydrogen gas (\( H_2 \)) in the presence of Lindlar's catalyst. The goal is to determine the major organic product of this reaction.
**Options**:
There are five potential products labeled I, II, III, IV, and V.
1. **Structure I**: This structure is fully saturated, showing single bonds only.
2. **Structure II**: This structure features a double bond (cis configuration) between two of the carbons originally involved in the triple bond.
3. **Structure III**: This structure features a double bond (trans configuration) between two of the carbons originally involved in the triple bond.
4. **Structure IV**: This structure shows multiple single bonds and a single double bond at a different position.
5. **Structure V**: This structure retains some structure of the triple bond but with additional single bonds.
**Multiple Choice Answers**:
- **A)** Structure I
- **B)** Structure II
- **C)** Structure III
- **D)** Structure IV
- **E)** Structure V
**Explanation**:
When an alkyne (triple bond) reacts with \( H_2 \) in the presence of Lindlar's catalyst, the reaction stops at the cis-alkene stage. This means the correct structure for this reaction should display a cis double bond.
**Correct Answer**:
**B) Structure II**
Structure II is the expected major organic product when an alkyne reacts with \( H_2 \) in the presence of Lindlar's catalyst, as it forms a cis alkene.
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