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. Check if the vapor composition for the following liquids will fall within their flammability range, at atmospheric pressure and 25°C:

1. Toluene; 

2. Acrylonitrile; 

3. Nitrobenzene; 

4. Acetone.