Which among the following has the lowest boiling point?

Explain why propanol has a higher boiling point than that of the hydrocarbon,butane?

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 $Y$?

$(CH_3)_2CHOH$ $\xrightarrow{dil. \, [O]} X$ $\xrightarrow[(ii) \, H_2O]{(i) \, CH_3MgBr} Y$. What is $Y$ here?

Of the following alcohols,the one that would react fastest with conc. $HCl$ and anhydrous $ZnCl_{2}$ is,

The reagent used for the dehydration of an alcohol is