$[Figure]$ $\xrightarrow[{S_N2}]{{KOH}}$
$\mathop I\limits_{({C_3}{H_6}C{l_2})} \xrightarrow{{KOH(aq)}}II\xrightarrow[{(ii){H_2}O/{H^ + }}]{{(i)C{H_3}MgBr}}III\xrightarrow{{Anhy.ZnC{l_2} + Conc.HCl}}$ તરત જ terbidity મળે છે
${image}$
તો $A$ શું છે.