Organic synthesis routes Quiz
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5 questions, one answer each
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1. A synthesis has three steps with yields of 90%, 80% and 70%. What is the overall yield?
- A. 80%
- B. 60%
- C. 50%
- D. 70%
2. Which reagent changes a haloalkane into a nitrile?
- A. KCN in aqueous ethanol
- B. NaOH(aq)
- C. HBr
- D. Tin and hydrochloric acid
3. What is the atom economy of the addition of HBr to ethene to give bromoethane?
- A. 50%
- B. 100%
- C. 74%
- D. 25%
4. Why is a solvent-free process considered greener?
- A. It raises the yield of every step
- B. It lowers the atom economy
- C. It increases the number of steps
- D. It avoids solvent waste and hazardous vapours
5. Which step converts nitrobenzene into phenylamine?
- A. Concentrated HNO₃ and concentrated H₂SO₄
- B. Ethanoyl chloride at room temperature
- C. Sn and concentrated HCl, then NaOH
- D. Ethanolic KOH, heat