Question:
Identify the correct reagent for Etard reaction.
Identify the correct reagent for Etard reaction.
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Etard reaction uses chromyl chloride \((CrO_2Cl_2)\) to convert the benzylic methyl group of an aromatic compound into an aldehyde without over-oxidation to the corresponding carboxylic acid.
Updated On: Jun 18, 2026
- \(CrO_2Cl_2,\ H_3O^+\)
- \(Pd-BaSO_4\)
- \(CrO_3,\ H_3O^+\)
- \(SnCl_2,\ HCl\)
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The Correct Option is A
Solution and Explanation
Step 1: Recall the Etard reaction.
The Etard reaction is used for the oxidation of the side chain of aromatic hydrocarbons.
In this reaction, a methyl group attached to a benzene ring is converted into an aldehyde group without further oxidation to the carboxylic acid.
For example, \[ C_6H_5CH_3 \longrightarrow C_6H_5CHO \]
Step 2: Identify the reagent used.
The characteristic reagent for the Etard reaction is chromyl chloride. \[ CrO_2Cl_2 \] The reaction is carried out in a non-aqueous solvent, followed by hydrolysis. \[ CrO_2Cl_2,\ H_3O^+ \]
Step 3: Analyze the other options.
Option (2): \[ Pd-BaSO_4 \] is Rosenmund's catalyst used for the reduction of acid chlorides to aldehydes.
Option (3): \[ CrO_3,\ H_3O^+ \] is a strong oxidizing system and is not the reagent for the Etard reaction.
Option (4): \[ SnCl_2,\ HCl \] is a reducing agent commonly used for converting nitro compounds into amines.
Step 4: Final conclusion.
Therefore, the correct reagent for the Etard reaction is \[ \boxed{CrO_2Cl_2,\ H_3O^+} \] Hence, the correct option is (1).
The Etard reaction is used for the oxidation of the side chain of aromatic hydrocarbons.
In this reaction, a methyl group attached to a benzene ring is converted into an aldehyde group without further oxidation to the carboxylic acid.
For example, \[ C_6H_5CH_3 \longrightarrow C_6H_5CHO \]
Step 2: Identify the reagent used.
The characteristic reagent for the Etard reaction is chromyl chloride. \[ CrO_2Cl_2 \] The reaction is carried out in a non-aqueous solvent, followed by hydrolysis. \[ CrO_2Cl_2,\ H_3O^+ \]
Step 3: Analyze the other options.
Option (2): \[ Pd-BaSO_4 \] is Rosenmund's catalyst used for the reduction of acid chlorides to aldehydes.
Option (3): \[ CrO_3,\ H_3O^+ \] is a strong oxidizing system and is not the reagent for the Etard reaction.
Option (4): \[ SnCl_2,\ HCl \] is a reducing agent commonly used for converting nitro compounds into amines.
Step 4: Final conclusion.
Therefore, the correct reagent for the Etard reaction is \[ \boxed{CrO_2Cl_2,\ H_3O^+} \] Hence, the correct option is (1).
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