Question

Given is mechanism of Beckmann rearrangement.

Rate determining step in Beckmann rearrangement :

• A. $I$
• B. $II$
• C. $III$
• D. $IV$

Answer 1

The correct option is B $II$

Backmann rearrangement is a reaction of oximes that can result in either amides or nitriles depending on the starting material is oximes derived from ketones from amides and oximes derrived from aldehydes from nitriles.
Therefore in backmann rearrangement there are five major steps
$\left(a\right)$ Protonation
$\left(b\right)$ rearrangement (Rate determining step)
$\left(c\right)$ Attack of carbocation
$\left(d\right)$ Deprotonation
$\left(e\right)$ Protonation