Question

rate of reaction toward Beckmann rearrangement
when
(i)$\gamma =C{H}_{3}C{O}_2$
(ii) $Cl-C{H}_2-{CO}_2^{-}$
(iii) $Ph-{SO}_2^{-}$

• A. (i) > (ii) > (iii)
• B. (ii) > (i) > (iii)
• C. (iii) > (ii) > (i)
• D. (iii) > (i) > (ii)

Answer 1

The correct option is C (iii) > (ii) > (i)

More good the leaving group $Y$ in Beckmann rearrangement. More will be rate of reaction.
So order of leaving group ability is: $Ph-S{O}_2^{⊝}>Cl-C{H}_{2}CO{O}^{⊝}>C{H}_{3}CO{O}^{⊝}$
So order of rate of reaction will be same.