a
(a) \(\mathop {C{H_3} - \mathop {\mathop C\limits^{||} {\mkern 1mu} }\limits^O {\mkern 1mu}  - Br}\limits_{{\text{Acetyl bromide}}} {\mkern 1mu} \mathop {\xrightarrow{{{\text{(i) Excess - }}C{H_3}MgI}}}\limits_{{\text{(ii) Saturated }}N{H_4}Cl} \) \(\mathop {\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,C{H_3}} \\ 
  | 
\end{array}} \\ 
  {C{H_3} - C - OH} \\ 
  | \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}{\mkern 1mu} }\limits_{2\, - \,methyl\,2 - \,propanol} {\mkern 1mu} \)