In Etard reaction, the final product is

Aromatic aldehyde

The correct answer is option 1. Aromatic aldehyde.

The reaction begins with an alkene – allylic hydrogen reaction with chromyl chloride, forming a precipitate called the Etard complex. This Etard complex is then decomposed with the help of a reducing environment to prevent its oxidation into a carboxylic acid. This reducing environment is generally provided by a saturated solution of aqueous sodium sulphite. Carbon tetrachloride is the most commonly used solvent for this method but carbon disulfide and chloroform can also be used as solvents. Aldehyde product of high purity can be obtained by purifying the Etard complex before its decomposition (so that its reaction with the unreacted reagent is prevented). The time frame for this equation may vary from a few days to several weeks but the yields are relatively high.

Mechanism :