There are a number of chemicals that are very flammable. Some are even explosive. That makes it hard to pick one. Volatile substances that have light molecules are probably the most flammable, and there are a number of things that could compete for the title "most flammable" or something similar.
The most flammable liquid is diethyl ether.
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Hydrogen is the most flammable gas among the options provided.
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Vegetable oil
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Although most correction fluids you can buy today are classed as non-flammable, some contain toluene, methanol and/or ethanol which are all flammable.
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If the air freshener is not flammable the propellent most likely is flammable.
Gasoline is the most flammable between gas and diesel due to its lower flash point and vaporization rate. Diesel is less flammable because it requires higher temperatures to ignite compared to gasoline.
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