Hello
The order of reactivity of halides with amines are is RI>RBr>RCl.
Lets us take a example:
When Excess ethyl iodide is treated with ammonia then the product formed is tetraethylammonium iodide
NH3+C2H5I-------->C8H20N+
Tetra ammonium iodide is a quaternary salt .
Good Luck
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