The intermediate compound 'X' in the following chemical reaction is : toluene + CrO₂Cl₂ xrightarrowCS₂ X xrightarrowH₃O^+ benzaldehyde 1. C₆H₅-CH(OCrOHCl₂)₂ 2. C₆H₅-CH(OCOCH₃)₂ 3. C₆H₅-CHCl₂ 4. C₆H₅-CHCl-H (as drawn: benzyl chloride)

Answer: 1. C₆H₅-CH(OCrOHCl₂)₂ Key idea: this is the Etard reaction: toluene is partially oxidised to benzaldehyde by chromyl chloride. Toluene + CrO₂Cl₂ in CS₂ forms a brown chromium complex, C₆H₅CH(OCrOHCl₂)₂ , which on hydrolysis ( H₃O^+ ) gives benzaldehyde. This complex is the intermediate X.

Topic: Aldehydes and ketones: HCN, NH3 derivatives, Grignard, oxidation, reduction (Wolff-Kishner, Clemmensen)· Organic Compounds Containing Oxygen

The intermediate compound 'X' in the following chemical reaction is :toluene + CrO_2Cl_2 CS_2 X H_3O^+ benzaldehyde

The intermediate compound 'X' in the following chemical reaction is :

toluene \(+ CrO_2Cl_2 \xrightarrow{CS_2} X \xrightarrow{H_3O^+}\) benzaldehyde

Etard reaction scheme and four structure options

1. \(C_6H_5-CH(OCrOHCl_2)_2\)

2. \(C_6H_5-CH(OCOCH_3)_2\)

3. \(C_6H_5-CHCl_2\)

4. \(C_6H_5-CHCl-H\) (as drawn: benzyl chloride)

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Answer: 1. \(C_6H_5-CH(OCrOHCl_2)_2\)

Key idea: this is the Etard reaction: toluene is partially oxidised to benzaldehyde by chromyl chloride.

Toluene + \(\mathrm{CrO_2Cl_2}\) in \(\mathrm{CS_2}\) forms a brown chromium complex, \(\mathrm{C_6H_5CH(OCrOHCl_2)_2}\), which on hydrolysis (\(\mathrm{H_3O^+}\)) gives benzaldehyde. This complex is the intermediate X.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The intermediate compound 'X' in the following chemical reaction is :toluene + CrO_2Cl_2 CS_2 X H_3O^+ benzaldehyde

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