19. For the reaction shown, select the expected major organic product. I II Na/NH3 III ? IV V

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**Question 19:**

For the reaction shown, select the expected major organic product.

**Reaction:**

- Starting material: An internal alkyne with a methyl branch.
- Reaction conditions: Na/NH₃

**Product Options:**

- **I**: A terminal alkene with a methyl branch.
- **II**: A more internal alkene with a methyl branch.
- **III**: An alkane with a single methyl branch.
- **IV**: An internal alkene with two methyl branches.
- **V**: An internal alkene with a methyl branch closer to the end.

**Explanation:**

In the question, the reaction involves an alkyne being transformed under the influence of sodium (Na) in liquid ammonia (NH₃), a process typically used for the partial reduction of alkynes into trans-alkenes. The options given are various isomers that represent potential major products from this reaction.
Transcribed Image Text:**Question 19:** For the reaction shown, select the expected major organic product. **Reaction:** - Starting material: An internal alkyne with a methyl branch. - Reaction conditions: Na/NH₃ **Product Options:** - **I**: A terminal alkene with a methyl branch. - **II**: A more internal alkene with a methyl branch. - **III**: An alkane with a single methyl branch. - **IV**: An internal alkene with two methyl branches. - **V**: An internal alkene with a methyl branch closer to the end. **Explanation:** In the question, the reaction involves an alkyne being transformed under the influence of sodium (Na) in liquid ammonia (NH₃), a process typically used for the partial reduction of alkynes into trans-alkenes. The options given are various isomers that represent potential major products from this reaction.
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