The reactant which is not used in preparation of benzaldehyde in Etard method is:

toluene

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ethylbenzene

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benzoyl chloride

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sodium benzoate

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Solution

The correct options are
B ethylbenzene
C benzoyl chloride
D sodium benzoate
In Etard reaction, toluene reacts with $C r O_{2} C l_{2}$ to form benzaldehyde.
The reaction is as follows:
$C_{6} H_{5} C H_{3} + C r O_{2} C l_{2} C S_{2} - -- \to H_{3} O^{+} C_{6} H_{5} C H O$

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