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MHT CET202618 April 2026Evening ShiftChemistryCarboxylic Acid DerivativesActual

Identify the product obtained when isopropyl magnesium chloride in dry ether reacts with dry ice forming a complex, hydrolysed further.

Options

  1. APropanoic acid
  2. BPropanal
  3. C2 - Methylpropanoic acid
  4. D2 - Methylpropanol

Correct answer

C. 2 - Methylpropanoic acid

Step-by-step solution

Isopropyl magnesium chloride is (CH₃)₂CHMgCl . Dry ice is solid CO₂ . When a Grignard reagent reacts with dry ice, it undergoes nucleophilic addition to the carbonyl group of CO₂ to form a magnesium carboxylate complex. (CH₃)₂CHMgCl + O=C=O (CH₃)₂CH-COOMgCl Upon acid hydrolysis, the complex yields a carboxylic acid. (CH₃)₂CH-COOMgCl + H₂O (CH₃)₂CH-COOH + Mg(OH)Cl The product (CH₃)₂CH-COOH is 2-methylpropanoic acid. Answer: 2 - Methylpropanoic acid

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