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The IUPAC nomenclature of organic compound 'A' is But-2-enoic acid. The weight of carbon dioxide produced by complete combustion of 44 g of the organic compound 'A' would be
But-2-enoic acid is $$\text{CH}_3\text{CH}{=}\text{CHCOOH}$$, i.e. $$\text{C}_4\text{H}_6\text{O}_2$$ with molar mass 86 g/mol. Each mole gives 4 mol of $$\text{CO}_2$$, so 44 g gives $$\frac{44}{86} \times 4 \times 44 = \frac{7744}{86} \approx 90\ \text{g}$$ of $$\text{CO}_2$$. This is greater than 88 g.
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