$C_{6} H_{5} C H_{3} C r O_{2} C l_{2} - ---- \to A H_{2} O - - \to B$
The functional group present in B and name of the reaction would be:

- C H O

, Gattermann aldehyde synthesis

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- C H O

, Etard reaction

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- C O C H_{3}

, Friedel Crafts reaction

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- C H O

, Oxo reaction

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Solution

The correct option is B $- C H O$ , Etard reaction
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 corresponding aldehyde.

$C_{6} H_{5} C H_{3} C r O_{2} C l_{2} - ---- \to C_{6} H_{5} C H (O C r O H C l_{2})_{2} H_{2} O - - \to C_{6} H_{5} C H O$

Thus, the functional group present in B is -CHO, an aldehyde group.

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