$(ii)\,R\, - \,CONHBr\, + \,KOH\, \to \,R\, - \,NCO\, + \,KBr\, + \,{H_2}O$
$(iii)\,R\, - \,NCO\, + \,2KOH\,\, \to \,R\, - \,N{H_2}\, + \,{K_2}C{O_3}$
(જ્યાં $Me$ એ- $CH _{3}$ છે.)
(image) $\xrightarrow{{SOC{l_2}}}\,B\,\xrightarrow{{N{H_3}}}\,C$$\,\xrightarrow[{B{r_2}}]{{NaOH}}\,D$