$\begin{matrix}
   O  \\
   ||  \\
   H-C-H,  \\
\end{matrix}\begin{matrix}
   O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,O\,\,\,\,  \\
   ||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,||\,\,\,\,\,  \\
   H-C-C{{H}_{2}}-C-C-C{{H}_{3}},  \\
\end{matrix}\begin{matrix}
   \,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O  \\
   \,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||  \\
   C{{H}_{3}}-C-C{{H}_{2}}-C-H  \\
\end{matrix}$

આલ્કેન$(A)$ શું હશે ?

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

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

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

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