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The reagents used in Etard reaction (I) is $\mathrm{CrO}_2 \mathrm{Cl}_2$ and Stephen reaction (II) is $\mathrm{SnCl}_2 / \mathrm{HCl}$. In Etard reaction, toluene in presence of chromyl chloride gives a brown complex which gives benzaldehyde
In Stephen's reaction, nitriles underges reduction followed by hydrolysis to give aldehyde.
In Stephen's reaction, nitriles underges reduction followed by hydrolysis to give aldehyde.
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