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MHT CET202522 Apr 2025Evening ShiftChemistryCarboxylic Acid DerivativesActual

In a reaction, ( CH ₃ )₂ CHMgBr + CO ₂ [ ether ] dry A [ dil HCl ] H OH ~B . Find the product ' B ' of above reaction.

Options

  1. APropanoic acid
  2. B2-Methyl propanoic acid
  3. CButanoic acid
  4. D2,2-dimethyl ethanoic acid

Correct answer

B. 2-Methyl propanoic acid

Step-by-step solution

The Grignard reagent isopropyl magnesium bromide , ( CH ₃)₂ CHMgBr , undergoes carboxylation with CO ₂ in dry ether to form a magnesium carboxylate intermediate. ( CH ₃ )₂ CHMgBr + CO ₂ ( CH ₃ )₂ CHCOO ^- MgBr ^+ Hydrolysis with dilute HCl yields the carboxylic acid product. ( CH ₃ )₂ CHCOO ^- MgBr ^+ + H ₃ O ^+ ( CH ₃ )₂ CHCOOH + Mg ²⁺ + Br ^- + H ₂ O The IUPAC name of ( CH ₃)₂ CHCOOH is 2-methylpropanoic acid , corresponding to option B.

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