(A) In the $Etard$ reaction,toluene is treated with chromyl chloride $(CrO_2Cl_2)$ in the presence of carbon disulfide $(CS_2)$ to form a brown chromi

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(A) In the $Etard$ reaction,toluene is treated with chromyl chloride $(CrO_2Cl_2)$ in the presence of carbon disulfide $(CS_2)$ to form a brown chromium complex,which upon hydrolysis gives benzaldehyde. The reaction is: $C_6H_5CH_3 + 2CrO_2Cl_2$ $\xrightarrow{CS_2} C_6H_5CH(OCrCl_2OH)_2$ $\xrightarrow{H_3O^+} C_6H_5CHO$. Therefore,the correct option is $A$.

Class 12 Chemistry 8-1.Aldehydes and Ketones Preparation

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The reaction in which the methyl group on a benzene ring is converted to an aldehydic group is called:

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A
$Etard$ reaction
B
$Friedel-Crafts$ reaction
C
$Rosenmund$ reaction
D
$Gatterman-Koch$ reaction

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8-1.Aldehydes and Ketones

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Which among the following compounds is obtained when calcium formate is dry distilled alone?

MediumMHT CET 2020

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In column - $I$ reaction name,in column - $II$ reactant and in column - $III$ product are given,match column - $I$ with column - $II$ and column - $III$ with the correct option.

Column - $I$ and $II$ Column - $III$

$(A).$ Rosenmund reaction - $(i).$ $H_2, Pd, BaSO_4$ $(p).$ Benzene to benzaldehyde

$(B).$ Stephen reaction - $(iii).$ $SnCl_2, HCl$ $(q).$ Benzoyl chloride to benzaldehyde

$(C).$ Etard reaction - $(iv).$ $CrO_2Cl_2, CS_2$ $(r).$ Toluene to chromium complex

$(D).$ Gatterman-Koch reaction - $(ii).$ $CO, HCl$ anhydrous $AlCl_3/CuCl$ $(s).$ $RCN \to RCHO$

Column - $I$ and $II$	Column - $III$
$(A).$ Rosenmund reaction - $(i).$ $H_2, Pd, BaSO_4$	$(p).$ Benzene to benzaldehyde
$(B).$ Stephen reaction - $(iii).$ $SnCl_2, HCl$	$(q).$ Benzoyl chloride to benzaldehyde
$(C).$ Etard reaction - $(iv).$ $CrO_2Cl_2, CS_2$	$(r).$ Toluene to chromium complex
$(D).$ Gatterman-Koch reaction - $(ii).$ $CO, HCl$ anhydrous $AlCl_3/CuCl$	$(s).$ $RCN \to RCHO$

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Which of the following reactions does not produce benzaldehyde?

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Toluene is converted to benzaldehyde by oxidation with.......

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What are $X$ and $Y$ in the following reaction sequence ?
$C_6H_5N_2^+Cl^{-}$ $\xrightarrow{X} C_6H_5CN$ $\xrightarrow[\text{(ii) } H_2O]{\text{(i) } CH_3MgBr} Y$

MediumAP EAMCET 2025

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The reaction in which the methyl group on a benzene ring is converted to an aldehydic group is called:

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Which among the following compounds is obtained when calcium formate is dry distilled alone?

Which of the following reactions does not produce benzaldehyde?

Toluene is converted to benzaldehyde by oxidation with.......

What are $X$ and $Y$ in the following reaction sequence ?$C_6H_5N_2^+Cl^{-}$ $\xrightarrow{X} C_6H_5CN$ $\xrightarrow[\text{(ii) } H_2O]{\text{(i) } CH_3MgBr} Y$

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What are $X$ and $Y$ in the following reaction sequence ?
$C_6H_5N_2^+Cl^{-}$ $\xrightarrow{X} C_6H_5CN$ $\xrightarrow[\text{(ii) } H_2O]{\text{(i) } CH_3MgBr} Y$