Question

pbcl2 is more stable pbcl4 ?

Answer 1

Due to inert pair effect, higher oxidation state of an element is not stable as we move down the group. In other words, Pb+4 is less stable than Pb+2, hence PbCl4 is also less stable. PbCl4 is less stable than SnCl4 while PbCl2 is more stable than SnCl2