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

R N C O

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R C O . . N

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R C O . . N H B r

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R N C

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Solution

The correct option is D $R N C$
Hofmann bromamide degradation reaction proceeds as follows:
$R C O N H_{2} + B r_{2} + K O H \to R C O N H B r + K B r + H_{2} O$

$R C O N H B r + K O H \to R N C O + K B r + H_{2} O$

$R N C O + 2 K O H \to R N H_{2} + K_{2} C O_{3}$

Overall reaction:-
$R C O N H_{2} + B r_{2} + 4 K O H \to R N H_{2} + 2 K B r + K_{2} C O_{3} + 2 H_{2} O$

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