Give the reagents. NaBH4 O H30+ O Li/NH3 O H₂/Lindlar O H₂, Pd/C O NaOH

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### Question 7

**Instruction:**
Give the reagents.

**Reaction Transformation:**
The image shows the transformation of a compound with a benzene ring and a triple bond attached to it (giving a structure named 1-phenyl-1-butyne) into a compound with a benzene ring and a double bond (giving a structure named 1-phenyl-1-butene).

**Reagent Options:**
- NaBH₄
- H₃O⁺
- Li/NH₃
- H₂/Lindlar
- H₂, Pd/C
- NaOH

**Explanation of Options:**

- **NaBH₄:** Sodium borohydride; used for the reduction of aldehydes and ketones but not suitable for reducing triple bonds.
- **H₃O⁺:** Hydronium ion; typically used in acid-catalyzed reactions but not suitable for selective reduction of triple bonds to double bonds.
- **Li/NH₃:** Lithium in liquid ammonia; known for performing dissolving metal reductions to form trans-alkenes.
- **H₂/Lindlar:** Lindlar’s catalyst; used for the selective partial hydrogenation of alkynes to cis-alkenes.
- **H₂, Pd/C:** Palladium on carbon with hydrogen; used for complete hydrogenation, turning alkynes directly to alkanes.
- **NaOH:** Sodium hydroxide; used as a strong base but not typically involved in reduction reactions of alkynes.

Based on the reaction shown, where a triple bond is converted to a double bond, **H₂/Lindlar** appears to be the most appropriate reagent to achieve the desired product through partial hydrogenation.
Transcribed Image Text:### Question 7 **Instruction:** Give the reagents. **Reaction Transformation:** The image shows the transformation of a compound with a benzene ring and a triple bond attached to it (giving a structure named 1-phenyl-1-butyne) into a compound with a benzene ring and a double bond (giving a structure named 1-phenyl-1-butene). **Reagent Options:** - NaBH₄ - H₃O⁺ - Li/NH₃ - H₂/Lindlar - H₂, Pd/C - NaOH **Explanation of Options:** - **NaBH₄:** Sodium borohydride; used for the reduction of aldehydes and ketones but not suitable for reducing triple bonds. - **H₃O⁺:** Hydronium ion; typically used in acid-catalyzed reactions but not suitable for selective reduction of triple bonds to double bonds. - **Li/NH₃:** Lithium in liquid ammonia; known for performing dissolving metal reductions to form trans-alkenes. - **H₂/Lindlar:** Lindlar’s catalyst; used for the selective partial hydrogenation of alkynes to cis-alkenes. - **H₂, Pd/C:** Palladium on carbon with hydrogen; used for complete hydrogenation, turning alkynes directly to alkanes. - **NaOH:** Sodium hydroxide; used as a strong base but not typically involved in reduction reactions of alkynes. Based on the reaction shown, where a triple bond is converted to a double bond, **H₂/Lindlar** appears to be the most appropriate reagent to achieve the desired product through partial hydrogenation.
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