$\begin{array}{*{20}{c}}
  {C{H_3}\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - CH - C = CH} 
\end{array}\xrightarrow[{{H_2}O}]{{HgS{O_4},{H_2}S{O_4}}}X$ $\xrightarrow[{(ii)\,conc.{H_2}S{O_4}/\Delta }]{{(i)\,{C_2}{H_5}MgBr,{H_2}O}}Y$

$n - Bu -\equiv\frac{(i) n-BuLi,n - C _{5} H _{11} Cl}{(ii) Lindlar\,\, cat, H _{2}}$

$C{{H}_{3}}CH\,=\,\,C{{H}_{2}}\,+\,\,{{H}_{2}}O\,\,+\,\,[O]\,\,\underset{Acid}{\mathop{\xrightarrow{KMn{{O}_{4}}}}}\,$$\begin{array}{*{20}{c}}
  {C{H_3} - CH - C{H_2}} \\ 
  {\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ 
  {\,\,\,\,\,\,\,\,OH\,\,\,\,\,\,\,OH} 
\end{array}$ $\xrightarrow{{[O]}}{\mkern 1mu} {\mkern 1mu} X{\mkern 1mu} {\mkern 1mu}  + {\mkern 1mu} {\mkern 1mu} HCOOH$

$X$ શું છે ?