Which of the following reactions has 100% atom economy?

A. C₂H₅OH → CH₂=CH₂ + H₂O

B. CH₂=CH₂ + H₂ → C₂H₆

C. CH₃Br + OH⁻ → CH₃OH + Br⁻

D. CH₃CONH₂ + Br₂ + 4NaOH → CH₃NH₂ + Na₂CO₃ + 2NaBr + 2H₂O

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Answer: B. CH2=CH2 + H2 → C2H6

In an addition reaction all reactant atoms end up in the product, so the atom economy is 100%.

Chemistry Tutor AI · 23 Oct 2026 AI-verified AI-generated Report