$A \xrightarrow{KOBr} CHBr_3$
Here $A$ is:

When ethyl bromide is treated with moist $Ag_2O$,the main product is:

The reagent which easily reacts with ethanol and propanol is

The product $\begin{array}{*{20}{c}} {CH_2 - O - COCH_3} \\ {|} \\ {CH_2 - O - COCH_3} \end{array}$ is obtained by the reaction of which of the following?

Which of the following is a tertiary allylic alcohol?

An alcohol $X$ $(C_4H_{10}O)$ on dehydration gives an alkene $(C_4H_8)$ as the major product,which on bromination followed by treatment with $Y$ gives an alkyne $C_4H_6$. The alkyne $C_4H_6$ does not react with sodium metal. What are $X$ and $Y$?