Which of the following compounds will undergo Cannizzaro reaction ?

Options

A. `CH_(3)CHO`
B. `CH_(3)COCH_(3)`
C. `C_(6)H_(5)CHO`
D. `C_(6)H_(5)CH_(2)CHO`

Explanation

To determine which of the given compounds will undergo the Cannizzaro reaction, we need to identify whether they contain alpha hydrogen atoms. The Cannizzaro reaction occurs with aldehydes that do not have alpha hydrogen atoms.

Let's analyze each option step by step:

### Step 1: Analyze the first compound (CS3-CHO)
- **Compound:** CS3-CHO (Acetaldehyde)
- **Alpha Hydrogens:** Acetaldehyde has three alpha hydrogen atoms (the three hydrogen atoms attached to the carbon adjacent to the carbonyl group).
- **Conclusion:** Since it has alpha hydrogens, it will **not** undergo the Cannizzaro reaction.

### Step 2: Analyze the second compound (CS3-CO-CH3)
- **Compound:** CS3-CO-CH3 (Acetone)
- **Alpha Hydrogens:** Acetone has six alpha hydrogen atoms (the six hydrogen atoms attached to the two methyl groups adjacent to the carbonyl group).
- **Conclusion:** Since it has alpha hydrogens, it will **not** undergo the Cannizzaro reaction.

### Step 3: Analyze the third compound (C6-H5-CHO)
- **Compound:** C6-H5-CHO (Benzaldehyde)
- **Alpha Hydrogens:** Benzaldehyde has no alpha hydrogen atoms (the carbon adjacent to the carbonyl group is part of the phenyl ring, which does not contribute any hydrogen atoms).
- **Conclusion:** Since it has no alpha hydrogens, it **will** undergo the Cannizzaro reaction.

### Step 4: Analyze the fourth compound (C6-H5-CH2-CHO)
- **Compound:** C6-H5-CH2-CHO (Benzylaldehyde)
- **Alpha Hydrogens:** Benzylaldehyde has two alpha hydrogen atoms (the two hydrogen atoms attached to the CH2 group adjacent to the carbonyl group).
- **Conclusion:** Since it has alpha hydrogens, it will **not** undergo the Cannizzaro reaction.

### Final Answer
Based on the analysis, the compound that will undergo the Cannizzaro reaction is **C6-H5-CHO (Benzaldehyde)**.

### Summary of Results:
- **CS3-CHO:** No Cannizzaro reaction (has alpha hydrogens).
- **CS3-CO-CH3:** No Cannizzaro reaction (has alpha hydrogens).
- **C6-H5-CHO:** **Undergoes Cannizzaro reaction** (no alpha hydrogens).
- **C6-H5-CH2-CHO:** No Cannizzaro reaction (has alpha hydrogens).