Etard's reaction involves the preparation of Benzaldehyde from:

• (A) Toluene
• (B) Ethyl benzene
• (C) Benzoyl chloride
• (D) Sodium benzoate

Etard's reaction is a chemical process used to convert toluene into benzaldehyde. This transformation involves the oxidation of toluene using chromyl chloride.

Correct Answer

The correct option is (A) Toluene.

Overview of the Reaction

In this reaction, toluene is treated with chromyl chloride, leading to the formation of benzaldehyde. This method is significant in organic chemistry for synthesizing aromatic aldehydes.

Other Options Explained

• (B) Ethyl benzene: This compound does not directly yield benzaldehyde through Etard's reaction.
• (C) Benzoyl chloride: This is a different type of compound and does not undergo Etard's reaction.
• (D) Sodium benzoate: This compound is not involved in the Etard's reaction for producing benzaldehyde.

In summary, toluene is the starting material for Etard's reaction to produce benzaldehyde.