Gasoline ignites because gasoline is flammable. (simple answer)
A more detailed answer would be.
Gasoline produces flammable vapors at a much lower temperature than almost any other 'common' chemical. It is the vapors that ignite rather than the chemical itself. Also Gasoline vapors are heavier than air.
Any 'Flammable' chemical will ignite in the presence of an open flame or spark if there are sufficient fumes.
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