Primary alcohols can be obtained from the reaction of the $RMgX$ with

What is the major organic product of the following sequence of reactions?
$(CH_3)_2CHCH_2OH$ $\xrightarrow{PBr_3}$ $\xrightarrow{Mg}$ $\xrightarrow{C_2H_4O}$ $\xrightarrow{H_3O^+} ?$

Which of the following reagents are required to prepare $3-$ethylpentan$-3-$ol?

Consider the following reaction sequence:
$CH_3-CH(OH)-CH_3$ $\xrightarrow{PBr_3} (X)$ $\xrightarrow{Mg} (Y)$ $\xrightarrow{C_2H_4O (epoxide)} (Z)$ $\xrightarrow{H_2O, \Delta} ?$
What is the final product of this reaction?

From which of the following is tertiary butyl alcohol obtained by the action of methyl magnesium iodide?

An alcohol,$X$ $(C_5H_{12}O)$ in the presence of $Cu / 573 \ K$ gives $Y$ $(C_5H_{10})$. The reactants required for the preparation of $X$ are