The source of nitrogen in Gabriel synthesis of amines is

1. sodium amide, NaN3

2. sodium uzide, NaNO2

3. potassium cyanide, KCN

4. potassium phthalimide C6H4(CO)2 NK+

Hint: It is a substitution reaction

Source of nitrogen in Gabriel phthalimide synthesis is potassium phthalimide. The reaction is as follows: