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What is the product formed when toluene (C6H5CH3) is treated with chromyl chloride (CrO2Cl2)?

1. benzaldehyde
2. toluic acid
3. phenylacetic acid
4. benzoic acid

Correct answer: benzaldehyde

Solution

Toluene with chromyl chloride (Etard reaction) oxidises the methyl group only as far as the aldehyde, giving benzaldehyde, not phenylacetic acid.

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