Benzyl alcohol is obtained from benzaldehyde by

Options

A. Fittig reaction
B. Cannizaro reaction
C. Kolbe reaction
D. Wurtz reaction

Explanation

To obtain benzyl alcohol from benzaldehyde, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: We start with benzaldehyde (C6H5CHO), which is the compound we want to convert into benzyl alcohol (C6H5CH2OH).

2. **Select the Reaction**: The transformation of benzaldehyde to benzyl alcohol can be achieved through a reaction with a concentrated hydroxide ion (OH-) or a concentrated base.

3. **Reaction Mechanism**: The reaction involves the nucleophilic attack of the hydroxide ion on the carbonyl carbon of benzaldehyde. This leads to the formation of a tetrahedral intermediate.

4. **Formation of Benzyl Alcohol**: The tetrahedral intermediate then collapses, resulting in the formation of benzyl alcohol and the benzoate ion (C6H5COO-).

5. **Identify the Type of Reaction**: This process is known as the Cannizzaro reaction, which is a disproportionation reaction where one molecule of benzaldehyde is oxidized to benzoate ion while another is reduced to benzyl alcohol.

6. **Conclusion**: Therefore, benzyl alcohol is obtained from benzaldehyde through the Cannizzaro reaction.

### Final Answer:
Benzyl alcohol is obtained from benzaldehyde by the Cannizzaro reaction.

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