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\( \boldsymbol{P h C H}_{2} \boldsymbol{C H}_{3} \frac{(i) C r O_{2} C l_{2} / C C l_{4}}{(i i) H_{3} O^{+}} \) \( \boldsymbol{P h C H}_{2} \boldsymbol{C H O} \) The above reaction is an example of which name reaction?

1. Rossenmund reduction
2. Birch reduction
3. Mendius reduction
4. Etard reduction

Correct answer: Etard reduction

Solution

Chromyl chloride oxidizes the benzylic carbon of an alkyl side chain on an aromatic ring to the corresponding aldehyde without overoxidation under these conditions. That transformation is known as the Etard reaction.

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