Compound $(P)$ is

What are $X$ and $Y$ in the following reaction sequence?
$C_2H_5OH$ $\xrightarrow{Cl_2} \underline{X}$ $\xrightarrow{Cl_2} \underline{Y}$

Product $(C)$ is

Which of the following substances gives a yellow precipitate with $I_2$ and alkali?

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 reactions takes place when tertiary butanol is passed over heated copper at $573 \ K$?