$\begin{array}{*{20}{c}}
  {C{H_3}C{H_2}CH - C{H_2}} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Br\,\,\,\,\,\,\,\,\,Br\,\,} 
\end{array}\xrightarrow[\begin{subarray}{l} 
  (ii)\,NaN{H_2} \\ 
  in\,liq.\,N{H_3} 
\end{subarray} ]{{(i)\,KOH\,alc.}}$

$I. \,CH_3 - H$

$II.\, CH_3CH_2-H$

$III.\, CH_2 = CH - CH_2-H$

$IV.\, C_6H_5$

$Ca{C_2} + 2{H_2}O \to Ca{(OH)_2} + {C_2}{H_2}$

${C_2}{H_2} + {H_2} \to {C_2}{H_4}$

$n({C_2}{H_4}) \to {( - C{H_2} - C{H_2} - )_n}$

$64.1\, kg$ $Ca{C_2}$માંથી મેળવેલ પોલિઇથિલિનનો જથ્થો  ......$kg$ છે.