\((ii)\,R\, - \,CONHBr\, + \,KOH\, \to \,R\, - \,NCO\, + \,KBr\, + \,{H_2}O\)
\((iii)\,R\, - \,NCO\, + \,2KOH\,\, \to \,R\, - \,N{H_2}\, + \,{K_2}C{O_3}\)