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Among the following which one does not act as an intermediate in Hofmann rearrangement?
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$\mathrm{RNC}$
(ii) $\mathrm{RCONHBr}+\mathrm{KOH} \rightarrow \mathrm{RNCO}+\mathrm{KBr}+\mathrm{H}_2 \mathrm{O}$
(iii) $\mathrm{RNCO}+2 \mathrm{KOH} \rightarrow \mathrm{RNH}_2+\mathrm{K}_2 \mathrm{CO}_3$
$\mathrm{RCONH}_2+\mathrm{Br}_2+4 \mathrm{KOH} \rightarrow \mathrm{RNH}_2+2 \mathrm{KBr}$
$+\mathrm{K}_2 \mathrm{CO}_3+2 \mathrm{H}_2 \mathrm{O}$
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