Question:
The reagent/s employed in Etard reaction is/are
The reagent/s employed in Etard reaction is/are
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The Etard reaction is an alternative to side-chain chlorination followed by hydrolysis, but it directly gives the aldehyde.
Updated On: Apr 24, 2026
- Cl\(_2\) hν, H\(_3\)O\(^+\)
- CrO\(_2\)Cl\(_2\) CS\(_2\), H\(_3\)O\(^+\)
- CO, HCl, anhydrous AlCl\(_3\) CuCl
- SnCl\(_2\), HCl
- DIBAL-H
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The Etard reaction is a specific method for the oxidation of a methyl group attached to an aromatic ring directly to an aldehyde group.
Step 2: Detailed Explanation:
The Etard reaction uses chromyl chloride (CrO\(_2\)Cl\(_2\)) in an inert solvent like carbon disulfide (CS\(_2\)) to oxidize a benzylic methyl group (-CH\(_3\)) to an aldehyde (-CHO). The intermediate complex is then hydrolyzed with water (H\(_3\)O\(^+\)) to yield the aromatic aldehyde. For example, toluene is converted to benzaldehyde.
Step 3: Final Answer:
The reagents employed are CrO\(_2\)Cl\(_2\) CS\(_2\), followed by H\(_3\)O\(^+\).
The Etard reaction is a specific method for the oxidation of a methyl group attached to an aromatic ring directly to an aldehyde group.
Step 2: Detailed Explanation:
The Etard reaction uses chromyl chloride (CrO\(_2\)Cl\(_2\)) in an inert solvent like carbon disulfide (CS\(_2\)) to oxidize a benzylic methyl group (-CH\(_3\)) to an aldehyde (-CHO). The intermediate complex is then hydrolyzed with water (H\(_3\)O\(^+\)) to yield the aromatic aldehyde. For example, toluene is converted to benzaldehyde.
Step 3: Final Answer:
The reagents employed are CrO\(_2\)Cl\(_2\) CS\(_2\), followed by H\(_3\)O\(^+\).
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