3. Draw the major product to each of the following reactions. HCI b. H2 Lindlar's catalyst C, H20 H2SO4, H9SO4

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Draw the major product to each reaction.
### Question 3: Draw the Major Product for Each Reaction

**a.**

Reactant: Alkyne  
Reagent: HCl

**b.**

Reactant: Alkyne with a branched alkyl group  
Reagents: H₂ and Lindlar's Catalyst

**c.**

Reactant: Alkyne with a branched alkyl group  
Reagents: H₂O, H₂SO₄, and HgSO₄

### Explanation:

**a. Reaction with HCl:**
The alkyne will undergo hydrohalogenation, where the hydrogen and chlorine atoms add across the triple bond, resulting in a vinyl halide.

**b. Hydrogenation with Lindlar's Catalyst:**
This reaction converts an alkyne to a cis-alkene (Z-alkene). Lindlar’s catalyst selectively reduces alkynes to alkenes without further reducing the alkenes to alkanes.

**c. Hydration with Acid Catalysis:**
The alkyne undergoes oxymercuration-demercuration hydration, resulting in a ketone. HgSO₄ and H₂SO₄ catalyze the addition of water to the triple bond, forming a keto group on the more substituted carbon (Markovnikov addition).

These reactions are fundamental in organic chemistry for converting alkynes to other functional groups.
Transcribed Image Text:### Question 3: Draw the Major Product for Each Reaction **a.** Reactant: Alkyne Reagent: HCl **b.** Reactant: Alkyne with a branched alkyl group Reagents: H₂ and Lindlar's Catalyst **c.** Reactant: Alkyne with a branched alkyl group Reagents: H₂O, H₂SO₄, and HgSO₄ ### Explanation: **a. Reaction with HCl:** The alkyne will undergo hydrohalogenation, where the hydrogen and chlorine atoms add across the triple bond, resulting in a vinyl halide. **b. Hydrogenation with Lindlar's Catalyst:** This reaction converts an alkyne to a cis-alkene (Z-alkene). Lindlar’s catalyst selectively reduces alkynes to alkenes without further reducing the alkenes to alkanes. **c. Hydration with Acid Catalysis:** The alkyne undergoes oxymercuration-demercuration hydration, resulting in a ketone. HgSO₄ and H₂SO₄ catalyze the addition of water to the triple bond, forming a keto group on the more substituted carbon (Markovnikov addition). These reactions are fundamental in organic chemistry for converting alkynes to other functional groups.
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