To prepare propan-2-ol from methyl magnesium bromide , the other reagent requird is _________

Options

A. HCHO
B. `CH_3CHO`
C. `C_2H_5OH`
D. `CH_3COCH_3`

Answer

To prepare propan-2-ol from methyl magnesium bromide, we need to identify the other reagent required for the reaction. Here’s a step-by-step solution:

### Step 1: Identify the Product
The product we want to prepare is propan-2-ol. Propan-2-ol has the following structure:

- It is an alcohol with three carbon atoms (C3).
- The hydroxyl (-OH) group is attached to the second carbon.

### Step 2: Analyze the Grignard Reagent
The reagent given is methyl magnesium bromide (CH3MgBr). This is a Grignard reagent, which acts as a nucleophile in organic reactions.

### Step 3: Determine the Carbon Contribution
Since the Grignard reagent (CH3-) contributes one carbon atom, we need to find a reactant that contributes the remaining two carbon atoms to form the three-carbon product (propan-2-ol).

### Step 4: Identify the Other Reagent
To achieve this, we can use acetaldehyde (CH3CHO) as the other reagent. Acetaldehyde has two carbon atoms and will react with the methyl group from the Grignard reagent.

### Step 5: Reaction Mechanism
1. The Grignard reagent (CH3MgBr) will attack the carbonyl carbon of acetaldehyde (CH3CHO).
2. This will form a tetrahedral intermediate.
3. Upon hydrolysis (addition of water), this intermediate will yield propan-2-ol.

### Conclusion
Thus, the other reagent required to prepare propan-2-ol from methyl magnesium bromide is **acetaldehyde (CH3CHO)**.

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