Identify the correct reagent for Etard reaction.

Identify the correct reagent for Etard reaction.
  1. $\mathrm{CrO}_2 \mathrm{Cl}_2, \mathrm{H}_3 \mathrm{O}^{+}$
  2. $\mathrm{Pd}-\mathrm{BaSO}_4$
  3. $\mathrm{CrO}_3, \mathrm{H}_3 \mathrm{O}^{+}$
  4. $\mathrm{SnCl}_2, \mathrm{HCl}$

Solution

The corfect reagent for Etard reaction is $\mathrm{CrO}_2 \mathrm{Cl}_2, \mathrm{H}_3 \mathrm{O}^{+}$. In case, the side chain contains a group higher than $-\mathrm{CH}_3$ group, the end carbon atom of the chain is oxidised by $\mathrm{CrO}_2 \mathrm{Cl}_2$ to $-\mathrm{CHO}$ group. e.g.

Asked in: AP EAMCET 2022 (08 Jul Shift 2)

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