In which of the following reactions, the intermediate species acyl nitrene `(R-overset(O)overset(||)(C)-ddot(N: ))` and intermediate compound alkyl isocyanate `(R - N = C = O)` are involved ?

Options

A. `R-oversetoverset(O)(||)C-NH_2overset(Br_2+KOH)tooverset(H_2O)toR-NH_2`
B. `R-oversetoverset(O)(||)C-NH-OHunderset(H_2O)overset(Theta)overset(OH)tooverset(MeOH)toR-NH-overset(O)overset(||)C-OMe`
C. `R-oversetoverset(O)(||)C-N_3underset(H_2O)overset(Delta)toR-NH_2`
D. `R-oversetoverset(O)(||)C-OHunderset(H_2O)overset(HN_3+H^(+))tooverset(H_2O)tooverset(PhOH)toR-NH-oversetoverset(O)(||)C-OPh`

Answer

A,B,C,D

Explanation

(A) is Hofmann bromamide reaction
(B)is Lossen rearreangement reaction
(C )is Curtius rearrangement reaction
(D) is Schmidt rearrangement reaction