Question

Pbx2 is more stable than pbx4 whyis more stable than pbc4 why

Answer 1

The oxidation state of Pb in Pbx2 is +2  and  oxidation state of Pb in Pbx4 is +4.

As we know Lead belongs to group 14 (carbon family) , where elements exhibit a unique property of variable valency due to inert pair effect. This inert pair effect is due to the shielding of s electrons by intervening d and f electrons. Hence number of electrons in d and f orbital  increases as we go down in a group, thus by making inert pair effect more prominent  and so

+4 oxidation state becomes less stable.

Hence ,

pbx2 is more stable than pbx4