Giải bài 1 trang 137 SGK Hoá học 11

\(\begin{align} & a)\,C{{H}_{2}}=C{{H}_{2}}+B{{r}_{2}}\to C{{H}_{2}}Br-C{{H}_{2}}Br \\ & b)\,3C{{H}_{2}}=CH-C{{H}_{3}}+2KMn{{O}_{4}}+4{{H}_{2}}O\to \underset{\left| {} \right.}{\mathop{3C{{H}_{2}}}}\,-\underset{\left| {} \right.}{\mathop{CH}}\,-C{{H}_{3}}+2Mn{{O}_{2}}+2KOH \\ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH\,\,\,\,\,\,\,OH \\ \end{align} \)