Which of the following carbonyl compounds will give recemisation reaction in the presence of acid base ?

Options

A. `CH_3-overset(O)overset(||)C-CH_2-CH_3`
B. `CH_3-overset(O)overset(||)C-underset(CH_3)underset(|)overset(H)overset(|)C-C_2H_5`
C. `CH_3-overset(O)overset(||)C-underset(CH_3)underset(|)overset(CH_3)overset(|)C-C_2H_5`
D. `CH_3-overset(O)overset(||)C-underset(CH_3)underset(|)overset(CH_3)overset(|)C-CH_3`

Answer

To determine which carbonyl compound will undergo racemization in the presence of acid-base conditions, we need to follow these steps:

### Step 1: Identify the Criteria for Racemization
Racemization occurs when a compound can convert between its enantiomers, leading to a mixture of both forms. For a carbonyl compound to undergo racemization, it must meet two criteria:
1. It must have at least one alpha hydrogen.
2. It must have a chiral center.

### Step 2: Analyze the Given Options
We will analyze each of the four options provided to identify if they meet the criteria for racemization.

- **Option 1:** Check for alpha hydrogens and chiral centers.
- **Option 2:** Check for alpha hydrogens and chiral centers.
- **Option 3:** Check for alpha hydrogens and chiral centers.
- **Option 4:** Check for alpha hydrogens and chiral centers.

### Step 3: Evaluate Each Option
1. **Option 1:**
- Contains alpha hydrogens but lacks a chiral center.
- **Conclusion:** No racemization.

2. **Option 2:**
- Contains alpha hydrogens and has a chiral center.
- **Conclusion:** Possible racemization.

3. **Option 3:**
- Lacks alpha hydrogens and lacks a chiral center.
- **Conclusion:** No racemization.

4. **Option 4:**
- Contains alpha hydrogens but lacks a chiral center.
- **Conclusion:** No racemization.

### Step 4: Identify the Correct Option
From the analysis, only **Option 2** contains both alpha hydrogens and a chiral center, making it the only compound that can undergo racemization in the presence of acid-base conditions.

### Final Answer
The correct answer is **Option 2**.

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