Question

Among the following which one does not act as an intermediate in Hofmann rearrangement

• A. $RNCO$
• B. $RCO\overset{.\mspace{6mu}.}{N}$
• C. $RCO\overset{.\mspace{6mu}.}{N}HBr$
• D. $RNC$

Answer 1

Answer: (D)

$RNC$

Answer 2

(i) $\overset{\overset{O}{||}}{RCNH_{2}}$+ Br₂ + KOH → RCONHBr+ KBr + H₂O

(ii) RCONHBr + KOH → RNCO + KBr + H₂O

(iii) RNCO + 2KOH → RNH₂ + K₂CO₃

RCONH₂ + Br₂ + 4KOH → RNH₂ + 2KBr + K₂CO₃

+2H₂O