the hofmann degradation of a mixture of m-deutriobenzamaide and benzamide-N where Nitrogen has a mass no. 15,gives only m-deutrioaniline and aniline-N(in aniline 'N' has mass no.15)..What does this finding show about the nature of the migration step???

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane