The reagents used in the Etard reaction $(I)$ and the Stephen reaction $(II)$ are:
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- B$SnCl_2 / HCl$ and $CrO_2Cl_2$
- C$CrO_2Cl_2$ and $SnCl_2 / HCl$
- D$CrO_2Cl_2$ and $PCC$
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Consider the following reaction:
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