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MHT CET Medical202621 April 2026Morning ShiftChemistryAldehydes and KetonesActual

Identify a catalyst used in Stephen reaction from the following.

Options

  1. AZnCl ₂ and HCl
  2. BHgCl ₂ and HCl
  3. CSnCl ₂ and HCl
  4. DAgCl and HCl

Correct answer

C. SnCl ₂ and HCl

Step-by-step solution

The Stephen reaction involves the reduction of an alkyl cyanide (nitrile) to the corresponding aldehyde. The reagents used in this reaction are stannous chloride ( SnCl ₂ ) and hydrochloric acid ( HCl ). The reaction proceeds via the formation of an imine hydrochloride intermediate, which upon hydrolysis yields the aldehyde. R-C N + SnCl ₂ + HCl R-CH=NH HCl H₃O^+ R-CHO + NH ₄^+ Therefore, the correct catalyst/reagent is SnCl ₂ and HCl . Answer: SnCl ₂ and HCl

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