Ether can be used

The compound which does not react with sodium is

Ethanol when reacts with $PCl_5$ gives $A$,$POCl_3$ and $HCl$. $A$ reacts with dry $Ag_2O$ to form $B$ (major product) and $AgCl$. $A$ and $B$ respectively are

Describe the nucleophilic reactions of ethers with $HX$ and provide examples.

On the treatment of the following compound with a strong acid,the most susceptible site for bond cleavage is

Chloroethane reacts with $X$ to form diethyl ether. What is $X$?