Aldehydes other than formaldehyde react with Grignard reagent to give addition products which on hydrolysis give

Options

A. tertiary alcohols
B. secondary alcohols
C. primary alcohols
D. carboxylic acids.

Explanation

To solve the question regarding the reaction of aldehydes (other than formaldehyde) with Grignard reagents, we can break it down into a series of steps:

### Step 1: Understanding the Reactants
We start with an aldehyde (let's take acetaldehyde, CH₃CHO, as an example) and a Grignard reagent (for instance, methyl magnesium bromide, CH₃MgBr).

### Step 2: Reaction Mechanism
Grignard reagents are strong nucleophiles. The carbon atom in the Grignard reagent (CH₃MgBr) has a partial negative charge, making it nucleophilic. The carbonyl carbon in the aldehyde (C=O) has a partial positive charge, making it electrophilic.

### Step 3: Nucleophilic Addition
When the Grignard reagent reacts with the aldehyde, the nucleophilic carbon from the Grignard reagent attacks the electrophilic carbon of the carbonyl group. This results in the formation of a tetrahedral intermediate.

### Step 4: Formation of the Addition Product
The addition product can be represented as follows:
- The structure will be: CH₃-CH(OH)-C(=O)MgBr
- Here, the oxygen from the carbonyl group becomes negatively charged (alkoxide ion), and the magnesium bromide becomes positively charged.

### Step 5: Hydrolysis of the Addition Product
When the addition product is hydrolyzed (usually by adding water), the alkoxide ion (O⁻) will pick up a proton (H⁺) from water, leading to the formation of an alcohol.

### Step 6: Identifying the Alcohol
The final product after hydrolysis will be:
- CH₃-CH(OH)-CH₃ (which is 2-propanol or isopropyl alcohol).
- This is a secondary alcohol because the carbon bearing the hydroxyl group (OH) is attached to two other carbon atoms.

### Conclusion
Thus, the reaction of an aldehyde (other than formaldehyde) with a Grignard reagent results in the formation of a secondary alcohol upon hydrolysis.

### Final Answer
The major product formed after hydrolysis is a secondary alcohol.

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