$C{H_3}COOH\xrightarrow{{LiAl{H_4}}}A\mathop {\xrightarrow{{{H^ + }}}}\limits_{443\,K} B\xrightarrow{{B{r_2}}}C\mathop {\xrightarrow{{alc.}}}\limits_{KOH} D$
$CH_3 CH_2 CH=CH_2 \xrightarrow{{HBr/{H_2}{o_2}}}\,Y\,\xrightarrow{{{C_2}{H_5}ONa}}Z$
${H_2}C\, - \,\,\mathop C\limits_{\mathop |\limits_D } H\, - \,\,\mathop C\limits_{\mathop |\limits_{C{H_3}} } H\, - \,\,C{H_3}\, + \,\,Br\,\, \to \,\,'X'\,\, + \,\,HBr$