Answer:
In ammonium salt, the central nitrogen(N) atom is bonded with the four different substituents. There is no lone pair of electrons in ammonium salt due to which the rapid interconversion of the two isomeric forms at room temperature is not observed. Thus, the chirality of the N atom in ammonium salts cannot be ignored.
Step-by-step explanation:
it can lead to different biologic and chemical properties.
interconversion cannot occur because there is no nonbonded electron pair on the nitrogen atom which makes the nitrogen atom just like a carbon atom with four different groups around it.