Question

why PCL5 exist as pcl4 positive and pcl6 negative ​

Answer 1

Answer:

PCl5 is unstable in its original form therefore it form cation or anion to stabilise

Explanation:

PCl5 is unstable due to electronic repulsion at axial bond.

it exists as ions (PCl4+, PCl6+) as ionic bonding stabilises crystalline nature.

PCl4+ and PCl6- having tetrahedral and octahedral structures respectively fit into each other providing extra stability.