$C{H_3}\, - \,\,C\, \equiv \,CH\,\,\xrightarrow{{HBr}}\,\,C{H_3}\, - \,\,\mathop {\mathop C\limits_{\mathop |\limits_{Br} } }\limits^{\mathop |\limits^{Br} } \,\, - \,\,C{H_3}$
${C_2}{H_2}\xrightarrow{{{O_3}}}X\xrightarrow{{Zn/C{H_3}COOH}}Y$


પ્રક્રિયામાં $A$(મુખ્યત્વે) ...... હશે.