Which of the reacrion is used for preparing `2^(@)` alcohol ?

Options

A. `CH_(3) MgX+HCOOC_(2) H_(5)`
B. `HCOOC_(2)H_(5)+2 " Mol of " CH_(3) MgX`
C. `CH_(3)MgX+HCHO`
D. `CH_(3) COCH_(3) +CH_(3) MGX`

Answer

To prepare a secondary alcohol, we need to identify the correct reaction from the given options. Let's analyze the steps involved in the process:

### Step-by-Step Solution:

1. **Understanding Secondary Alcohols**:
A secondary alcohol is one where the hydroxyl group (-OH) is attached to a carbon atom that is bonded to two other carbon atoms.

2. **Identifying the Reactions**:
The question provides four reactions. We need to analyze each one to see which one leads to the formation of a secondary alcohol.

3. **Analyzing Reaction 1**:
- The reaction involves a compound with a carbonyl group (C=O) and an ethyl group (O-C2H5).
- When treated with a Grignard reagent (CH3MgX), the carbonyl carbon is attacked, leading to the formation of a ketone.
- This reaction does not yield a secondary alcohol.

4. **Analyzing Reaction 2**:
- In this reaction, the same carbonyl compound is treated with two moles of CH3MgX.
- The first mole forms an intermediate, and the second mole further reacts with it.
- This results in the formation of a secondary alcohol, specifically isopropyl alcohol (2-propanol).

5. **Analyzing Reaction 3**:
- Here, the reaction involves a carbonyl compound and one mole of Grignard reagent.
- The product formed is a primary alcohol, not a secondary alcohol.

6. **Analyzing Reaction 4**:
- This reaction involves a ketone and a Grignard reagent.
- The product formed is a tertiary alcohol, which is not what we are looking for.

7. **Conclusion**:
- After analyzing all four reactions, we find that **Reaction 2** is the one that produces a secondary alcohol.

### Final Answer:
The reaction that produces a secondary alcohol is **Reaction 2**.

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