Pbcl4 is less stable than pbcl2
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Pb has 2 electrons in s orbital while 2 electrons in p orbital . So s electrons are inert and can not be removed and give valency of 4. Hence Pb forms 2 ions instead of 4 and PbCl2 becomes stable. ➡️Moreover , due to inert pair effect, higher oxidation state of an element is not stable as we move down the group.
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