Which of the following reactions will not give propane ?

Options

A.
B.
C.
D.

Explanation

To determine which of the given reactions will not produce propane, we will analyze each reaction step by step.

### Step 1: Analyze Reaction A
- **Reaction A** involves a chlorine compound reacting with magnesium in ether, followed by the addition of water.
- The chlorine atom is replaced by a methyl group (Me) during the reaction with magnesium, forming a Grignard reagent.
- When water is added, it reacts with the Grignard reagent to form propane (C3H8) and magnesium hydroxide chloride (Mg(OH)Cl).
- **Conclusion**: Reaction A produces propane.

### Step 2: Analyze Reaction B
- **Reaction B** involves a compound reacting with diborane (B2H6) in ether, followed by the addition of acetic acid (CH3COOH).
- The reaction with B2H6 leads to the formation of a trialkylborane, which upon hydrolysis with acetic acid will yield propane.
- **Conclusion**: Reaction B produces propane.

### Step 3: Analyze Reaction C
- **Reaction C** involves a chlorine compound reacting with phosphorus and hydroiodic acid (HI).
- The chlorine atom is replaced, leading to the formation of propane.
- **Conclusion**: Reaction C produces propane.

### Step 4: Analyze Reaction D
- **Reaction D** involves a carbonyl compound (with a double bond to oxygen) reacting with a Grignard reagent (CH3MgX) followed by water.
- The reaction with the Grignard reagent will lead to the formation of an alcohol, not propane. The carbonyl compound does not lead to the formation of propane in this case.
- **Conclusion**: Reaction D does not produce propane.

### Final Answer
The reaction that will not give propane is **Reaction D**.

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