3-methyl-3-hexanol can be prepared by -

Options

A. `CH_3Mgl` and 3-hexanone, followed by hydrolysis
B. `C_2H_5 Mgl` and 2-Pentanone, followd by hydrolysis
C. `C_3H_7 Mgl` and 2-butananone, followd by hydrolysis
D. `C_4 H_9 Mgl` and propanon, followed by hydrolysis

Answer

To prepare 3-methyl-3-hexanol, we can follow these steps:

### Step 1: Identify the structure of 3-methyl-3-hexanol
3-methyl-3-hexanol has the following structure:
- It is a hexanol (6 carbon atoms) with a methyl group (CH3) attached to the third carbon.
- The hydroxyl group (OH) is also on the third carbon.

### Step 2: Choose a suitable starting material
A suitable starting material for the synthesis of 3-methyl-3-hexanol is 2-pentanone. This ketone has five carbon atoms and can be reacted with a Grignard reagent to introduce the additional methyl group.

### Step 3: Prepare the Grignard reagent
To introduce the methyl group, we can prepare a Grignard reagent from methyl iodide (CH3I) and magnesium (Mg). The reaction is as follows:
\[ \text{CH}_3\text{I} + \text{Mg} \rightarrow \text{CH}_3\text{MgI} \]
This Grignard reagent (CH3MgI) will act as a nucleophile in the next step.

### Step 4: React the Grignard reagent with 2-pentanone
Now, we will react the prepared Grignard reagent (CH3MgI) with 2-pentanone (C5H10O). The reaction is:
\[ \text{CH}_3\text{MgI} + \text{C}_5\text{H}_{10}\text{O} \rightarrow \text{C}_6\text{H}_{14}\text{O} + \text{MgI(OH)} \]
In this reaction, the nucleophilic methyl group from the Grignard reagent attacks the carbonyl carbon of 2-pentanone, forming an alkoxide intermediate.

### Step 5: Hydrolyze the alkoxide
The alkoxide intermediate formed in the previous step can be hydrolyzed by adding water (H2O):
\[ \text{C}_6\text{H}_{14}\text{O} + \text{H}_2\text{O} \rightarrow \text{3-methyl-3-hexanol} + \text{Mg(OH)I} \]
This hydrolysis step converts the alkoxide into the desired alcohol, 3-methyl-3-hexanol.

### Final Structure
The final product is 3-methyl-3-hexanol, which has the following structure:
- A hydroxyl group (OH) on the third carbon.
- A methyl group (CH3) also on the third carbon.

### Summary
Thus, 3-methyl-3-hexanol can be prepared by the following sequence:
1. Synthesize the Grignard reagent (CH3MgI).
2. React it with 2-pentanone to form an alkoxide.
3. Hydrolyze the alkoxide to obtain 3-methyl-3-hexanol.

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