Which statement is correct about the production and use of ethanol as a biofuel?
1 )
Biofuel ethanol is produced by the fermentation of glucose in the presence of yeast and air.
Biofuel ethanol is purified by fractional distillation.
3 )
No carbon dioxide is released when biofuel ethanol is burned.
4 )
Biofuel ethanol burns with a cleaner flame than ethanol made by hydration of ethene.
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