Which one of the following is true regarding Etard reaction?

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 distilation 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 A Oxidation of toluene to benzaldehyde by chromylchloride
Chromyl chloride oxidizes toluene to benzaldehyde. This reaction is known as etard reaction. The solvent used is carbon disulphide, Chromium chloride converts methyl group to a chromium complex. This on acid hydrolysis, gives the corresponding aldehyde.
$C_{6} H_{5} C H_{3} C r O_{2} C l_{2} - ---- \to C S_{2} C_{6} H_{5} C H (O C R O H C l_{2})_{2} H_{2} O / H^{+} - ---- \to C_{6} H_{5} C H O$

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