MHT CET20244 May 2024Morning ShiftChemistryAldehydes and KetonesActual
Which of the following is Stephen reaction?
Options
- AR - COCl [ Pd-BaSO ] H ₂ R - CHO + HCl
- BR - CN [ i) H ₃ O ⁺] i) SnCl ₂, HCl R - CHO + NH ₄ Cl
- CR - CHO [ ] Zn - Hg conc. HCl R - CH ₃+ H ₂ O
- DR - CHO [ ii) KOH , HO - CH ₂- CH ₂- OH ] i) H ₂- NH ₂ R - CH ₂- R
Correct answer
B. R - CN [ i) H ₃ O ⁺] i) SnCl ₂, HCl R - CHO + NH ₄ Cl
Step-by-step solution
Nitriles are reduced to imine hydrochloride by stannous chloride in presence of hydrochloric acid which on acid hydrolysis gives corresponding aldehydes. This reaction is called Stephen reaction. R - CN [ ii) H ₃ O ⁺] i HCl R - CHO + NH ₄ Cl