Discussion
A reaction may have a 100 per cent yield and still a poor atom economy if
Answer: A
Correct answer: much of the reactant mass leaves as by-product
Yield and atom economy answer different questions. Yield asks how much of the theoretical product was obtained; atom economy asks how much of the reactant mass ends up in that product at all. A reaction that converts every molecule of substrate but sheds most of its mass as a by-product has a perfect yield and a poor atom economy.
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