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COMEDK20269 May 2026Morning ShiftChemistryAminesActual

Identify the name of the reaction involved in conversion of A→B and name the compound B. ( CH ₃ CN [ H ₂ O ] H ⁺ A [ H ⁺ / H ₂ O ] Cl 2 / Red Phosphorous B )

Options

  1. AEsterification, methyl ethanoate
  2. BHell-Volhard-Zelinsky reaction, 2-chloro-ethanoic acid
  3. CRiemer-Tiemann reaction, 1-chloro-ethanoic acid
  4. DKolbe's reaction, Ethanoic acid

Correct answer

B. Hell-Volhard-Zelinsky reaction, 2-chloro-ethanoic acid

Step-by-step solution

Hydrolysis of methyl cyanide in the presence of an acid yields ethanoic acid. CH ₃ CN H ^+ / H ₂ O CH ₃ COOH (Compound A) Ethanoic acid reacts with chlorine in the presence of red phosphorus to give -chloroethanoic acid. This reaction is known as the Hell-Volhard-Zelinsky reaction. CH ₃ COOH [ H ^+ / H ₂ O ] Cl ₂ / Red P ClCH ₂ COOH (Compound B) Compound B is 2-chloroethanoic acid. Answer: Hell-Volhard-Zelinsky reaction, 2-chloro-ethanoic acid

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