Which factor is effective in the preparation of alcohol from alkene using $Al_2O_3$?

$Isobutylene$ on hydroboration followed by oxidation with hydrogen peroxide in presence of base yields

The possible final products $R$ and $S$ of the following reaction sequence are:

Primary alcohol is mainly formed in which of the following reactions?

Heating of $2-$chloro$-1-$phenylbutane with $EtOK/EtOH$ gives $X$ as the major product. Reaction of $X$ with $Hg(OAc)_2/H_2O$ followed by $NaBH_4$ gives $Y$ as the major product. $Y$ is

The product in the following reaction is: $CH_3MgI + HCHO \to \text{Product}$