February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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37Percentage Yield Atom EconomyHard1 mark
mol of P reacts to form g of primary amine Q. The percentage yield of Q is %. [: C, 12.0; H, 1.0; Cl, 35.5; N, 14.0] Which row is correct?
a table of rows A-D, each giving the reagent and conditions for the reaction (KCN in ethanol with heat, or NH3 in ethanol heated under pressure) alongside a skeletal structure for P: a chlorocyclopentane ring (rows A and C) or a branched chloropentane chain, 1-chloro-2-methylbutane (rows B and D)