Question 18 Provide the reagents necessary to carry out the following conversion H O 1.03: 2. Zn/acetic acid O 1. H2O/ H2SO4 2. PCC/CH2C12 O 1.9-BBN; 2. H202/N2OH/H2O; 3. Cro3/H2SO4/H20 O 1.9-BBN: 2. H202/N2OH/H20 O 1. PCC/ CH2Cl2

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Chapter1: Chemical Foundations
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**Question 18**

**Objective:** Determine the reagents necessary to carry out the following organic conversion.

**Diagram:**

- **Left Structure:** A straight chain alkene with a triple bond (alkyne) positioned along the chain.
  
- **Right Structure:** A straight chain aldehyde with a carbon-oxygen double bond (carbonyl group) at the end of the chain.

**Options:**

1. **Option 1:** 
   - Step 1: O₃
   - Step 2: Zn/acetic acid

2. **Option 2:** 
   - Step 1: H₂O/H₂SO₄
   - Step 2: PCC/CH₂Cl₂

3. **Option 3:** 
   - Step 1: 9-BBN
   - Step 2: H₂O₂/NaOH/H₂O
   - Step 3: CrO₃/H₂SO₄/H₂O

4. **Option 4:** 
   - Step 1: 9-BBN
   - Step 2: H₂O₂/NaOH/H₂O

5. **Option 5:** 
   - Step 1: PCC/CH₂Cl₂

**Graph Explanation:** 

The reaction involves converting a carbon-carbon triple bond (alkyne) into a carbon-oxygen double bond (aldehyde). This type of reaction often involves oxidation and hydration steps, which are reflected in the potential reagent choices.
Transcribed Image Text:**Question 18** **Objective:** Determine the reagents necessary to carry out the following organic conversion. **Diagram:** - **Left Structure:** A straight chain alkene with a triple bond (alkyne) positioned along the chain. - **Right Structure:** A straight chain aldehyde with a carbon-oxygen double bond (carbonyl group) at the end of the chain. **Options:** 1. **Option 1:** - Step 1: O₃ - Step 2: Zn/acetic acid 2. **Option 2:** - Step 1: H₂O/H₂SO₄ - Step 2: PCC/CH₂Cl₂ 3. **Option 3:** - Step 1: 9-BBN - Step 2: H₂O₂/NaOH/H₂O - Step 3: CrO₃/H₂SO₄/H₂O 4. **Option 4:** - Step 1: 9-BBN - Step 2: H₂O₂/NaOH/H₂O 5. **Option 5:** - Step 1: PCC/CH₂Cl₂ **Graph Explanation:** The reaction involves converting a carbon-carbon triple bond (alkyne) into a carbon-oxygen double bond (aldehyde). This type of reaction often involves oxidation and hydration steps, which are reflected in the potential reagent choices.
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