Which one has the highest boiling point?

Alcohols react with active metals,e.g.,$Na, K$ etc. to give corresponding alkoxides. Write down the decreasing order of reactivity of sodium metal with primary,secondary and tertiary alcohols.

By means of calcium chloride,which of the following can be dried?

Identify $Z$ in the reaction sequence: $CH_3CH_2CH_2Br$ $\xrightarrow{Aq. NaOH} X$ $\xrightarrow{Al_2O_3, \Delta} Y$ $\xrightarrow{Cl_2/H_2O} Z$

The correct order of dehydration of alcohols is

The exact order of boiling points of the compounds $n$-pentane,isopentane,butanone,and $1$-butanol is: