Gabriel phthalimide is used for preparation of

Explanation

A reaction between alkyl halide and ammonia gives a mixture of amines `(1^(@),2^(@),3^(@),)` along with tetralkyl ammonium halide. The components of this mixture are not easy to separate To get pure `1^(@)` amine, Gabriel phthalimide synthesis is preferred. This is because in this case pure `1^(@)` amine is obtained from alkyl halide and ammonia.
This is because is this case pure `1^(@)` amine is obtained from alkyl halide and ammonia.