Nucleophilic properties of amines Quiz
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5 questions, one answer each
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1. Which feature of ammonia allows it to act as a nucleophile?
- A. Its high boiling point
- B. The lone pair on nitrogen
- C. Its three hydrogen atoms
- D. Its trigonal pyramidal shape alone
2. What is formed when excess bromoethane reacts with ammonia in several steps?
- A. Only ethylamine
- B. Ethanol
- C. A quaternary ammonium salt (with other amines)
- D. An amide
3. Why does the reaction stop at the quaternary ammonium ion?
- A. It is insoluble
- B. Nitrogen has no lone pair left
- C. Bromide ions run out
- D. It has a high Mr
4. In the mechanism, what does the second ammonia molecule do?
- A. Attacks the carbon
- B. Removes H⁺ from the intermediate
- C. Removes Br⁻
- D. Acts as an electrophile
5. Why is [CH₃(CH₂)₁₅N(CH₃)₃]⁺ Br⁻ a cationic surfactant?
- A. It has a positive ion with a long non-polar chain and a charged head
- B. It has a negative ion with a short chain
- C. It has no charge
- D. It is a primary amine