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MHT CET202620 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

In the following reaction, condition 'A' is -

Options

  1. AReduction with Zinc dust
  2. BDehydration with H ₂ SO ₄ / 443 K
  3. CTreatment with CS ₂ / low temperture
  4. DOxidation with CrO ₃

Correct answer

D. Oxidation with CrO ₃

Step-by-step solution

The given reaction shows the conversion of phenol to p -benzoquinone. This transformation is an oxidation reaction. Phenol is oxidized to p -benzoquinone by strong oxidizing agents such as chromic acid ( Na ₂ Cr ₂ O ₇ with H ₂ SO ₄ or CrO ₃ ). In contrast, reduction with zinc dust converts phenol to benzene, and CS ₂ at low temperature is used as a solvent for monohalogenation of phenol. Hence, condition 'A' is oxidation with CrO ₃ . Answer: Oxidation with CrO ₃

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