The reagent that converts a 1∘ amide to a 1∘ amine without changing the number of C atom is
The Conversion of an amide by action of NaOH and Br2 to primary amine that has one carbon less than the starting amide is known as Hofmann-Bromamide reaction.
R−O||C−NH2Br2+NaOH−−−−−−−→(or)NaoBr R−NH2+NaBr+Na2CO3