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JEE Advanced levelSingle correct optionDifficulty 3 of 3ev210

Ethanol is made by two routes. Route A: , yield 90%. Route B: , yield 60%. Use atomic masses H 1, C 12, O 16, Na 23, Br 80. Which statement is correct?

  1. ARoute B has the higher atom economy, but route A gives more ethanol per mole of limiting reactant
  2. BRoute A has the higher atom economy and gives more ethanol per mole of limiting reactant
  3. CRoute B has the higher atom economy and also gives more ethanol per mole of limiting reactant
  4. DRoute A has the higher atom economy, but route B gives more ethanol per mole of limiting reactant

Answer: A

Atom economy of A and of B , so B is higher. Yield is separate: per mole of limiting reactant, A gives 0.90 mol and B gives 0.60 mol ethanol. So atom economy and yield point in opposite directions.
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