$C{{H}_{3}}\,-\,\,\overset{\overset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{C}}\,H\,\,-\,\,C{{H}_{3}}(excess)\,\,+\,\,B{{r}_{2}}\,\xrightarrow{hv}$
$\,\,\,\,C{{H}_{3}}\,-\,\,\overset{\overset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{\underset{\underset{Br}{\mathop{|}}\,}{\mathop{C}}\,}}\,\,\,-\,\,C{{H}_{3}}\,+\,\,C{{H}_{3}}\,-\,\,CH\,\,-\,\,C{{H}_{2}}\,-\,\,Br$
$\,(b)\,\,CH\,-\,\,\overset{\overset{Br}{\mathop{|}}\,}{\mathop{\underset{\underset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{C}}\,}}\,\,\,-\,\,C{{H}_{3}}\,\underset{3{{\,}^{o H}}}{\mathop{{{1}^{o }}\,equi.}}\,\,\,1\,\,\times \,\,1600\,\,=\,\,1600\,\,=\,\,$ $\frac{1600}{1600\,\,+\,\,}\,.........\,\,\times \,\,100\,\,=\,\,99.4....$
$reagent$ શું હશે?