In the storage of flammable liquids, if the composition of the vapor-air mixture above the liquid surface falls within the flammability limits, a floating roof tank would be used or the tank blanketed with inert gas such as nitrogen (N₂). Determine if the floating roof or nitrogen gas blanketed tank is required for the storage of the following liquids at atmospheric pressure and 25^oC.

a) Toluene

b) Acrylonitrile

c) Nitrobenzene

d) Acetone