Amines: properties and reactionsEdexcel International A Level Chemistry: Mind map

Exam questions on Amines: properties and reactions

1. A technician is preparing 0.10 mol dm⁻³ solutions of ethylamine, CH₃CH₂NH₂, ammonia and phenylamine, C₆H₅NH₂, so that their behaviour with water can be compared. Ethylamine is a gas at room temperature that dissolves freely in water to give an alkaline solution.
   Explain why ethylamine is miscible with water.2 marks
2. Butylamine, CH₃CH₂CH₂CH₂NH₂, is used by a pharmaceutical company as a starting material. It is converted into a range of nitrogen-containing products by reacting it with different organic reagents.
   Write an equation, using structural formulae, for the reaction of butylamine with ethanoyl chloride, and name the organic product.2 marks
3. Phenylamine, C₆H₅NH₂, is a primary aromatic amine used in the manufacture of dyes. A student compares phenylamine with butylamine by measuring the pH of separate solutions of the same concentration and finds that the butylamine solution has the higher pH.
   Explain why phenylamine is a much weaker base than butylamine.3 marks