Etard reaction in the following is :

oxidation of toluene to benzaldehyde by chromylchloride

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oxidation of toluene to benzaldehyde by alkaline

K M n O_{4}

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dry distillation of calcium benzoate

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reaction of benzene with

C l_{2}

in the presence of UV light

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Solution

The correct option is B oxidation of toluene to benzaldehyde by chromylchloride
Chromyl chloride oxidizes toluene to benzaldehyde. This reaction is known as the Etard reaction. The solvent used is carbon disulfide. Chromium chloride converts the methyl group to a chromium complex. This complex on acid hydrolysis gives the corresponding aldehyde.
$C_{6} H_{5} C H_{3} C r O_{2} C l_{2} - ---- \to C_{6} H_{5} C H (O C r O H C l_{2})_{2} H_{2} O - - \to C_{6} H_{5} C H O$

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