i know that in the mechanism of the hofmann rearrangement occurs in two steps which are simultaneous.

But im confused that how an electron-releasing substituents can affect the rate of the overall reactions....and also tell me that the reaction undergoes in two ways-(1)by Sn¹ (2)by Sn²?????

'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