MHT CET202617 April 2026Evening ShiftChemistryAminesActual
Identify false statement from following regarding preparation of amines by Hofmann degradation method.
Options
- AIt is useful to convert amides to primary amines.
- BIn this -CO-group is reduced to - CH ₂- group.
- CMolar mass of the amine obtained is always less than the amide.
- DThe reagent used is Br ₂ and KOH _ (aq) .
Correct answer
B. In this -CO-group is reduced to - CH ₂- group.
Step-by-step solution
Hofmann bromamide degradation reaction is used for the conversion of primary amides to primary amines with one carbon atom less than the original amide. The general reaction is: R-CO-NH₂ + Br₂ + 4KOH R-NH₂ + K₂CO₃ + 2KBr + 2H₂O In this reaction, the carbonyl group ( -CO- ) is lost as potassium carbonate ( K₂CO₃ ), and the alkyl or aryl group migrates from the carbonyl carbon to the nitrogen atom. The -CO- group is not reduced to a -CH₂- group. The reduction of an amide to an amine where the -CO- group becomes a -CH