
$C{H_3}Cl\,\,\xrightarrow{{KCN}}\,\,(A)\,\,\xrightarrow{{{H_2}{O^ + }}}\,\,(B)\,\,\xrightarrow{{N{H_3}}}\,\,(C)\,\,\xrightarrow{\Delta }\,\,(D)$
${C_2}{H_5}Br\xrightarrow{{KCN}}A\xrightarrow{{Hydrolysis}}B$
${C_2}{H_5}OH + SOC{l_2}\xrightarrow{{{\text{Pyridine}}}}{C_2}{H_5}Cl + S{O_2} + HCl$