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Chromyl chloride converts methyl group to a chromium complex, which on acid hydrolysis gives corresponding aldehyde. This reaction is called
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Etard reaction
When toluene is treated with solution of chromyl chloride $\left(\mathrm{CrO}_{2} \mathrm{Cl}_{2}\right)$ in $\mathrm{CS}_{2}$, brown chrominum complex is obtained, which on acid hydrolysis gives benzaldehyde. This reaction is called Etard reaction.
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