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, let's break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Grignard Reagents**:
- Grignard reagents are organomagnesium compounds represented as R-MgX, where R is an alkyl or aryl group and X is a halogen. They act as strong nucleophiles due to the presence of the negatively charged carbon atom (R^-).

2. **Structure of Aldehydes**:
- Aldehydes have the general structure R'CHO, where R' is an alkyl group. The carbonyl carbon (C=O) in the aldehyde is electrophilic due to the partial positive charge on it, making it susceptible to nucleophilic attack.

3. **Nucleophilic Attack**:
- When a Grignard reagent (R-MgX) reacts with an aldehyde (R'CHO), the nucleophilic carbon (R^-) from the Grignard reagent attacks the electrophilic carbon of the carbonyl group in the aldehyde. This leads to the formation of a tetrahedral intermediate.

4. **Formation of the Addition Product**:
- The nucleophilic attack results in the formation of an alkoxide intermediate. The structure can be represented as:
\[ R' - C(OH)(R) - MgX \]
- Here, the carbon that was part of the carbonyl group now has an -OH group and is bonded to the R group from the Grignard reagent.

5. **Hydrolysis of the Addition Product**:
- Upon hydrolysis (reaction with water), the alkoxide intermediate is converted into an alcohol. The reaction can be represented as:
\[ R' - C(OH)(R) + H_2O \rightarrow R' - C(OH)(R) + Mg(OH)X \]
- This results in the formation of a secondary alcohol (2° alcohol) because the carbon that was originally part of the carbonyl group is now bonded to two other carbon atoms (one from the aldehyde and one from the Grignard reagent).

6. **Conclusion**:
- Therefore, the addition of Grignard reagents to aldehydes (other than formaldehyde) results in the formation of secondary alcohols upon hydrolysis.

### Final Answer:
The addition products of aldehydes (other than formaldehyde) with Grignard reagents, upon hydrolysis, yield secondary alcohols.

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