The boiling point of alcohols is $....$ than corresponding thiols.

The order of reactivity of the following alcohols toward $HCl$ is:
$(1)$ $F-CH_2-CH_2-CH(OH)-CH_3$
$(2)$ $F-CH_2-CH_2-CH_2-CH(OH)-CH_3$
$(3)$ $CH_3-CH(OH)-CH_3$
$(4)$ $Ph-CH_2-CH_2-OH$

When the vapours of tertiary butyl alcohol are passed through heated copper at $573 \ K$,the product formed is

Formation of diethyl ether from ethanol is based on a

Lead pipes are corroded quickly by

The correct order of decreasing reactivity towards $H_3PO_4$ for the following compounds is: