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se the image below to answer the following three questions. Note: Subscripts are not shown in nswer choices, ex: H2 should be H2, NH3 should be NH3. ? Product A Product B Product C The reagents that would selectively yield Product A are H2, Lindlar's catalyst The reagents that would selectively yield Product B are Na, NH3, -78°C . The reagents that would selectively yield Product C are H2, Pd/C

se the image below to answer the following three questions. Note: Subscripts are not shown in nswer choices, ex: H2 should be H2, NH3 should be NH3. ? Product A Product B Product C The reagents that would selectively yield Product A are H2, Lindlar's catalyst The reagents that would selectively yield Product B are Na, NH3, -78°C . The reagents that would selectively yield Product C are H2, Pd/C

Chemistry
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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### Organic Chemistry: Selective Hydrogenation of Alkynes #### Problem Statement: Use the image below to answer the following three questions. **Note:** Subscripts are not shown in answer choices, e.g., H2 should be H₂, NH3 should be NH₃. #### Reaction Scheme: 1. Starting Material: A molecule with a terminal alkyne group is given. 2. The reaction leading to the product is unspecified (a question mark is shown). 3. Possible Products: - **Product A**: Contains a double bond (cis-alkene). - **Product B**: Contains a double bond (trans-alkene). - **Product C**: A fully saturated hydrocarbon with no double or triple bonds. #### Questions: a. The reagents that would selectively yield **Product A** are: - **Answer**: H₂, Lindlar's catalyst. b. The reagents that would selectively yield **Product B** are: - **Answer**: Na, NH₃, -78°C. c. The reagents that would selectively yield **Product C** are: - **Answer**: H₂, Pd/C. #### Explanation of Graphical Elements: The image contains a chemical structure followed by a question mark to indicate an unspecified reaction, leading to three distinct products labeled as Product A, Product B, and Product C. The choices for reagents are given in a drop-down format for each product. 1. **Product A** contains a cis-double bond. The selective hydrogenation of the alkyne using H₂ and Lindlar's catalyst results in a cis-alkene. 2. **Product B** contains a trans-double bond. The selective hydrogenation of the alkyne with Na in liquid NH₃ at -78°C results in a trans-alkene. 3. **Product C** is a fully hydrogenated alkane, achieved by using H₂ with a palladium on carbon (Pd/C) catalyst. This curated information directs the student to understand the methods used in selective hydrogenation of alkynes, focusing on the role of different catalytic and reagent conditions.
Transcribed Image Text:### Organic Chemistry: Selective Hydrogenation of Alkynes #### Problem Statement: Use the image below to answer the following three questions. **Note:** Subscripts are not shown in answer choices, e.g., H2 should be H₂, NH3 should be NH₃. #### Reaction Scheme: 1. Starting Material: A molecule with a terminal alkyne group is given. 2. The reaction leading to the product is unspecified (a question mark is shown). 3. Possible Products: - **Product A**: Contains a double bond (cis-alkene). - **Product B**: Contains a double bond (trans-alkene). - **Product C**: A fully saturated hydrocarbon with no double or triple bonds. #### Questions: a. The reagents that would selectively yield **Product A** are: - **Answer**: H₂, Lindlar's catalyst. b. The reagents that would selectively yield **Product B** are: - **Answer**: Na, NH₃, -78°C. c. The reagents that would selectively yield **Product C** are: - **Answer**: H₂, Pd/C. #### Explanation of Graphical Elements: The image contains a chemical structure followed by a question mark to indicate an unspecified reaction, leading to three distinct products labeled as Product A, Product B, and Product C. The choices for reagents are given in a drop-down format for each product. 1. **Product A** contains a cis-double bond. The selective hydrogenation of the alkyne using H₂ and Lindlar's catalyst results in a cis-alkene. 2. **Product B** contains a trans-double bond. The selective hydrogenation of the alkyne with Na in liquid NH₃ at -78°C results in a trans-alkene. 3. **Product C** is a fully hydrogenated alkane, achieved by using H₂ with a palladium on carbon (Pd/C) catalyst. This curated information directs the student to understand the methods used in selective hydrogenation of alkynes, focusing on the role of different catalytic and reagent conditions.
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