\(C_6H_5CH = CH -CH_3 + HBr\) \(\to\) \(\mathop {{C_6}{H_5}CHC{H_{_2}}C{H_3}}\limits^{\mathop {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\limits^{Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,} } \)
$C{H_3}COOH\xrightarrow{{LiAl{H_4}}}A\mathop {\xrightarrow{{{H^ + }}}}\limits_{443\,K} B\xrightarrow{{B{r_2}}}C\mathop {\xrightarrow{{alc.}}}\limits_{KOH} D$