Grignard reagent is most suitable for preparation of which of the following with carbonyl compound ?

Options

A. `1^(@)` alcohols
B. `2^(@)` alcohols
C. `3^(@)` alcohols
D. All of these

Explanation

To determine which type of alcohol can be prepared using Grignard reagents with carbonyl compounds, let's analyze the reaction step by step.

### Step 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 are highly reactive and can react with carbonyl compounds.

**Hint:** Remember that Grignard reagents are made from alkyl halides and magnesium, and they are very reactive with electrophiles like carbonyl compounds.

### Step 2: Reaction with Aldehydes
When a Grignard reagent reacts with an aldehyde (e.g., formaldehyde), it forms a primary alcohol. The general reaction can be represented as follows:

1. Grignard reagent (R-MgX) + Aldehyde (R'CHO) → Grignard complex (R'CH(OMgX)R) → Primary alcohol (R'CH2OH) after hydrolysis.

**Hint:** Aldehydes lead to the formation of primary alcohols when reacted with Grignard reagents.

### Step 3: Reaction with Ketones
When a Grignard reagent reacts with a ketone (e.g., acetone), it forms a secondary alcohol. The reaction can be represented as:

1. Grignard reagent (R-MgX) + Ketone (R'CO-R'') → Grignard complex (R'R''C(OMgX)R) → Secondary alcohol (R'R''C(OH)R) after hydrolysis.

**Hint:** Ketones lead to the formation of secondary alcohols when reacted with Grignard reagents.

### Step 4: Summary of Alcohol Types Formed
- **Primary Alcohols:** Formed when Grignard reagents react with aldehydes.
- **Secondary Alcohols:** Formed when Grignard reagents react with ketones.
- **Tertiary Alcohols:** While Grignard reagents do not directly form tertiary alcohols from carbonyl compounds, they can react with ketones that have two alkyl groups leading to tertiary alcohols.

### Conclusion
Based on the analysis:
1. Grignard reagents can produce primary alcohols from aldehydes.
2. Grignard reagents can produce secondary alcohols from ketones.
3. Tertiary alcohols can also be formed indirectly through the reaction of Grignard reagents with certain ketones.

Thus, the most suitable answer to the question is **"all of these"** since Grignard reagents can prepare primary, secondary, and tertiary alcohols depending on the carbonyl compound used.

**Final Answer:** All of these (primary, secondary, and tertiary alcohols) can be prepared using Grignard reagents with carbonyl compounds.