Inert pair effect is predominant in:

Inert pair effect is predominant in Pb.

Explanation

The inert-pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals.  In lead (Pb) inert pair effect is most prominent because as we move down the group from carbon to lead the tendency of non-participation inner ns electrons in chemical bonding increases due to the large size of atoms.
So Pb is having more tendency of showing an inert pair effect.

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