$\begin{array}{1 1}(a)\;(i)CH_3MgI,H_3O^+(ii)H_2SO_4,\Delta \\(b)\;(i)HBr,R_2O_2(ii) CH_3MgI,H_3O^+\\(c)\;(i)CH_3MgI,,H_3O^+(ii)HBr\\(d)\;(i)CH_3MgI,H_3O^+(ii)H_2SO_4,\Delta (iii)HBr.R_2O_2\end{array}$
