Answer :

1.) C2H6 + O2 ---> CO2 + H2O  
2.) CH4 + O2 ---> CO2 + H2O
3.) C6H12O6 + O2 ---> CO2 + H2O
4.) C2H5OH + O2 ---> CO2 + H2O

(The numbers are the little tiny 2's or 3's next to the letters!)

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