Question

In the Etard reaction, the final product is

• A. Aromatic aldehyde
• B. Aromatic chloride
• C. Aromatic amine
• D. Aromatic alcohol

Answer 1

The Correct Option is A

The Étard reaction is a chemical reaction that oxidizes an aromatic methyl group to an aldehyde using chromyl chloride (CrO₂Cl₂).

Here's a breakdown of the reaction:

An aromatic compound with a methyl group (like toluene) reacts with chromyl chloride (CrO₂Cl₂) in carbon tetrachloride (CCl₄) or carbon disulfide (CS₂) as a solvent. The reaction forms a chromium complex, which is then hydrolyzed to produce an aromatic aldehyde.

For example, the reaction of toluene with chromyl chloride gives benzaldehyde:

C₆H₅CH₃ + 2CrO₂Cl₂ → C₆H₅CH(OCrOHCl₂)₂ → C₆H₅CHO

Therefore, the final product of the Étard reaction is an aromatic aldehyde.

Let's analyze the given options:

• Option 1: Aromatic aldehyde: This is the correct product.
• Option 2: Aromatic chloride: This is incorrect.
• Option 3: Aromatic amine: This is incorrect.
• Option 4: Aromatic alcohol: This is incorrect.

The correct answer is:

Option 1: Aromatic aldehyde