Aromatic aldehydes undero disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as `:`

Options

A. Wurtz's reaction
B. Cannizzaro reaction
C. Friedel-Craft's reaction
D. Claisen reaction

Answer

To solve the question regarding the disproportionation of aromatic aldehydes in the presence of sodium or potassium hydroxide, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Disproportionation**: Disproportionation is a reaction where a single substance is transformed into two different products, typically involving the oxidation of one part and the reduction of another.

2. **Identifying the Reaction**: In this case, aromatic aldehydes undergo disproportionation in the presence of a strong base (sodium or potassium hydroxide). This means that the aldehyde will be converted into an alcohol and a carboxylic acid.

3. **Example Reaction**: For example, if we take benzaldehyde (C6H5CHO) as the aromatic aldehyde, the reaction can be represented as:
\[ 2 \, C_6H_5CHO + NaOH \rightarrow C_6H_5COONa + C_6H_5CH_2OH \]
Here, one molecule of benzaldehyde is oxidized to form benzoic acid (C6H5COOH), while another molecule is reduced to form benzyl alcohol (C6H5CH2OH).

4. **Naming the Reaction**: This specific reaction is known as the **Cannizzaro Reaction**. It is characteristic of non-enolizable aldehydes (like benzaldehyde) that do not have alpha-hydrogens.

5. **Conclusion**: Therefore, the correct answer to the question is that the reaction is known as the **Cannizzaro Reaction**.

### Final Answer:
The reaction is known as the **Cannizzaro Reaction**.

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