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MHT CET202525 Apr 2025Evening ShiftChemistryHydrocarbonsActual

Identify the product formed in the following reaction. C ₆ H ₅- CH ₂- CH ₃ [ ii) H ₃ O ⁺] i) alk. KMnO ₄ Product

Options

  1. AC ₆ H ₅- CH ₂- COOH
  2. BC ₆ H ₅ CH ₂- CH ₂- COOH
  3. CC ₆ H ₅- OH
  4. DC ₆ H ₅- COOH

Correct answer

D. C ₆ H ₅- COOH

Step-by-step solution

The oxidation of ethylbenzene C ₆ H ₅ CH ₂ CH ₃ with strong oxidizing agents proceeds via benzylic oxidation, converting the entire alkyl chain to a carboxylic acid group. Alkaline KMnO ₄ oxidizes the benzylic carbon to a carboxylate salt, yielding potassium benzoate C ₆ H ₅ COO ^- K ^+ . Subsequent acidification with H ₃ O ⁺ produces benzoic acid C ₆ H ₅ COOH . The product is unequivocally benzoic acid, corresponding to option D. D

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