my opinion:
Chlorine is more electronegative than hydrogen, and this means that the hydrogen chloride molecule will be polar. Electrons in the hydrogen-chlorine bond will be attracted to the chlorine, producing hydrogen which is slightly positive and slightly negative chlorine.
Lone pairs on the nitrogen contained in the ammonia molecule are drawn to the slightly positive hydrogen atom in HCl. After the lone pair of nitrogen close to the hydrogen atom, electrons in the hydrogen-chlorine bond still would refuse to the chlorine.
Finally, the coordination bond is formed between the nitrogen and hydrogen, and chlorine is lost out as a chloride ion.
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