Select the compounds undergoing inter- or intra-molecular Cannizzaro reaction.

Options

A.
B.
C.
D.

Answer

To determine which compounds undergo inter- or intra-molecular Cannizzaro reactions, we need to analyze the given compounds for the presence of alpha hydrogens. Cannizzaro reactions occur in aldehydes and ketones that lack alpha hydrogens.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four compounds to analyze. Let's denote them as A, B, C, and D.

2. **Check for Alpha Hydrogens**:
- **Definition**: Alpha hydrogens are the hydrogens attached to the carbon adjacent to the carbonyl group (C=O).
- **Criteria**: Compounds that do not have alpha hydrogens can undergo Cannizzaro reactions.

3. **Analyze Each Compound**:
- **Compound A**:
- Structure: Contains an alpha carbon with one alpha hydrogen.
- Conclusion: **Cannot undergo Cannizzaro reaction** (due to the presence of alpha hydrogen).

- **Compound B**:
- Structure: Contains no alpha hydrogen.
- Conclusion: **Can undergo intramolecular Cannizzaro reaction** (since it has two carbonyl groups within the same molecule).

- **Compound C**:
- Structure: Contains no alpha hydrogen.
- Conclusion: **Can undergo intramolecular Cannizzaro reaction** (similar reasoning as compound B).

- **Compound D**:
- Structure: Contains an alpha carbon with two alpha hydrogens.
- Conclusion: **Cannot undergo Cannizzaro reaction** (due to the presence of alpha hydrogens).

4. **Final Selection**:
- The compounds that can undergo inter- or intramolecular Cannizzaro reactions are **Compound B and Compound C**.

### Summary of Results:
- **Compound A**: Cannot undergo Cannizzaro reaction.
- **Compound B**: Can undergo intramolecular Cannizzaro reaction.
- **Compound C**: Can undergo intramolecular Cannizzaro reaction.
- **Compound D**: Cannot undergo Cannizzaro reaction.

### Final Answer:
The compounds undergoing inter- or intramolecular Cannizzaro reactions are **B and C**.