Which of the following pairs does not share the same empirical formula? C2H6 and C4H12 C3H6O3 and C2H4O2 C3H8O and CH2O C2H8 and CH4 Need explanation

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Which of the forthcoming pairs does not portion-out the corresponding experimental formula? C2H6 and C4H12 C3H6O3 and C2H4O2 C3H8O and CH2O C2H8 and CH4 Need explanation
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Source amalgamate