When acetaldehyde is treated with Grignard reagent, followed by hydrolysis the product formed is :

Options

A. Primary alcohol
B. Secondary alcohol
C. Carboxylic acid
D. Tertiary alcohol

Answer

To solve the problem of what product is formed when acetaldehyde is treated with a Grignard reagent followed by hydrolysis, we can follow these steps:

### Step 1: Identify the Reactants
- The reactant is acetaldehyde, which has the molecular formula CH₃CHO. It can also be represented as:
\[ \text{Acetaldehyde} = \text{CH}_3\text{C}(=O)\text{H} \]

### Step 2: Understand the Grignard Reagent
- A Grignard reagent is typically represented as R-MgX, where R is an alkyl or aryl group, and X is a halogen. The key feature of Grignard reagents is that they act as nucleophiles due to the electron-rich carbon atom.

### Step 3: Reaction of Acetaldehyde with Grignard Reagent
- When acetaldehyde reacts with the Grignard reagent (R-MgX), the nucleophilic alkyl group (R) attacks the electrophilic carbon atom of the carbonyl group in acetaldehyde. The reaction can be represented as follows:
\[ \text{CH}_3\text{CHO} + \text{R-MgX} \rightarrow \text{CH}_3\text{C}(R)(OMgX) \]
- This forms a magnesium alkoxide intermediate.

### Step 4: Hydrolysis of the Intermediate
- The next step involves hydrolysis, where the intermediate is treated with water. This leads to the formation of an alcohol and a magnesium hydroxide salt:
\[ \text{CH}_3\text{C}(R)(OMgX) + \text{H}_2\text{O} \rightarrow \text{CH}_3\text{C}(R)(OH) + \text{Mg(OH)X} \]

### Step 5: Identify the Product
- The product formed after hydrolysis is a secondary alcohol because the carbon atom bonded to the hydroxyl group (OH) is attached to two other carbon atoms (one from the acetaldehyde and one from the Grignard reagent). Therefore, the structure of the product can be represented as:
\[ \text{CH}_3\text{C}(R)(OH) \]
- This confirms that the product is a secondary alcohol.

### Final Answer
- The product formed when acetaldehyde is treated with a Grignard reagent followed by hydrolysis is a secondary alcohol.

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