Which of the following has the highest boiling point?

Which of the following gives a $2^{\circ}$ alcohol as a major product upon reaction with $CH_{3}MgBr$ followed by $H_{2}O$?

Which of the following compounds would not react with Lucas reagent at room temperature?

Ethanol,when reacted with $PCl_5$,gives $A$,$POCl_3$,and $HCl$. $A$ reacts with silver nitrite $(AgNO_2)$ to form $B$ (major product) and $AgCl$. $A$ and $B$ are respectively:

Which of the following molecules has the maximum boiling point?

Identify the product $P$ of the following reaction:
$CH_3OH + CH_3MgX \longrightarrow P + MgX(OCH_3)$