Nitrogen compounds (AS)：练习题

Ethylamine can be prepared by reacting bromoethane with excess ammonia. What is the role of ammonia in this reaction?

What is the product of the reaction between propanone and a mixture of HCN and KCN, followed by heating?

Nitriles can be hydrolysed to form carboxylic acids. Which of the following reagents and conditions would achieve this transformation?

Which observation correctly describes the result of heating a mixture of an ammonium salt, such as \( NH_{4}Cl \), with an aqueous alkali, such as \( NaOH \)?

Which reagent and conditions are required to produce a primary amine from a halogenoalkane in a single step?

Explain why ammonia acts as a Brønsted–Lowry base and describe the change in the H–N–H bond angle when it reacts with an acid to form the ammonium ion.

A chemist wishes to synthesise propylamine starting from bromoethane.
(a) The first step involves reacting bromoethane with potassium cyanide, \(KCN\). State the reagents and conditions for this step and name the organic product formed.
(b) The product from part (a) is then converted into a carboxylic acid. State the type of reaction and the reagents needed.
(c) Alternatively, bromoethane can be converted directly to propylamine in a single step. Suggest the reagent and conditions required for this direct conversion.