Question:
Identify the name of following reaction.
Identify the name of following reaction.
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Etard reaction specifically uses chromyl chloride (CrO\(_2\)Cl\(_2\)) to oxidize a methyl group attached to an aromatic ring to an aldehyde.
Updated On: Jun 4, 2026
- Stephen reaction
- Etard reaction
- Rosenmund reaction
- Wolf-Kishner reaction
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
Toluene is treated with chromyl chloride (CrO\(_2\)Cl\(_2\)) in CS\(_2\) followed by hydrolysis to yield benzaldehyde. We need the name of this reaction.
Step 2: Key Formula or Approach:
This is a classic method for oxidation of methyl group on an aromatic ring to aldehyde.
Step 3: Detailed Explanation:
- Etard reaction: Toluene + CrO\(_2\)Cl\(_2\) → complex → H\(_3\)O\(^+\) → Benzaldehyde. - Stephen reaction: Reduction of nitrile to aldehyde using SnCl\(_2\)/HCl. - Rosenmund reduction: Acid chloride to aldehyde using H\(_2\)/Pd-BaSO\(_4\). - Wolf-Kishner reduction: Carbonyl to methylene.
Thus, the correct name is Etard reaction.
Step 4: Final Answer:
Option (B) is correct.
Toluene is treated with chromyl chloride (CrO\(_2\)Cl\(_2\)) in CS\(_2\) followed by hydrolysis to yield benzaldehyde. We need the name of this reaction.
Step 2: Key Formula or Approach:
This is a classic method for oxidation of methyl group on an aromatic ring to aldehyde.
Step 3: Detailed Explanation:
- Etard reaction: Toluene + CrO\(_2\)Cl\(_2\) → complex → H\(_3\)O\(^+\) → Benzaldehyde. - Stephen reaction: Reduction of nitrile to aldehyde using SnCl\(_2\)/HCl. - Rosenmund reduction: Acid chloride to aldehyde using H\(_2\)/Pd-BaSO\(_4\). - Wolf-Kishner reduction: Carbonyl to methylene.
Thus, the correct name is Etard reaction.
Step 4: Final Answer:
Option (B) is correct.
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