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Amount of substances

Hey, how do we answer this question. It’s one of the multi choice questions and is worth one mark
Which compound needs the greatest amount of oxygen for the complete combustion of 1 mol of the compound?
A ethanal
B ethanol
C ethane-1,2-diol D methanol

The answer to this question is ethanol
(edited 11 months ago)
i think its because the ratio of oxygen atoms to hydrogen and carbon atoms in the molecule is smallest in ethanol, therefore it needs the most oxygen to combust completely?

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