$A \xrightarrow[ { Cu\; tube }]{\text { Redhot }}\mathrm{B} \xrightarrow[ Anhydrous AlCl_3]{\mathrm{CH}_{3} \mathrm{Cl}(1 \mathrm{eq}} \mathrm{C}$
($A$ એ સૌથી ઓછું પરમાણ્વીય વજન ધરાવતું આલ્કાઇન છે)
$(1) \,Cl_2 \to 2Cl^\bullet $
$(2)\, Cl^\bullet + CH_4 \to CH_3Cl + H^\bullet $
$(3)\, Cl^\bullet +CH_4 \to CH^\bullet _3 + HCl$
$(4)\, H^\bullet +Cl_2 \to HCl + Cl^\bullet $
$(5)\, CH^\bullet _3 + Cl_2 \to CH_3Cl + Cl^\bullet $
$\begin{matrix}
CH-C{{O}_{2}}H \\
\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
CH-C{{O}_{2}}H \\
\end{matrix}\xrightarrow[(two\,mole)]{NaOH}(A)\xrightarrow{electrolysis}(B);$
તો $'A'$ શું છે ?