${C_6}{H_5}C{H_3}\xrightarrow{{Oxidation}}A\xrightarrow{{NaOH}}B\xrightarrow[\Delta ]{{sodalime}}C$
${C_7}{H_8}\xrightarrow[\Delta ]{{3C{l_2}}}A\xrightarrow{{B{r_2}/Fe}}B\xrightarrow{{Zn/HCl}}C$
${H_3}C - C \equiv CH\,\xrightarrow[{HgS{O_4}}]{{{H_2}O,\,{H_2}S{O_4}}}\,\mathop {intermediate}\limits_{(A)} \,$$ \to \,\mathop {\Pr oduct}\limits_{(B)} $
ઉપર ની પ્રકિયા માં નીપજ $(A)$ શું હશે ?