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Chemistry · PYQ NEET UG 2021

हिन्दी

The intermediate compound ‘X’ in the following chemical reaction is _______. \( \text{CH}_3 + \text{CrO}_2\text{Cl}_2 \xrightarrow{\text{CS}_2} \text{X} \xrightarrow{\text{H}_3\text{O}^+} \text{CHO} \)

  1. \( \text{CH}(\text{OCOCH}_3)_2 \)
  2. \( \text{CH}(\text{Cl})_2 \)
  3. \( \text{CH}(\text{Cl})\text{H} \)
  4. \( \text{CH}(\text{OCrOHCl}_2)_2 \)

Correct answer · Option 4

\( \text{CH}(\text{OCrOHCl}_2)_2 \)

Explanation

This is Etard reaction where toluene is oxidized by chromyl chloride (\text{CrO}_2\text{Cl}_2) to form a chromium complex intermediate (chromadichloride complex) which on hydrolysis yields benzaldehyde. The correct intermediate structure is option (4).
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