The most stable compound is:

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${PbBr}_{4}$

${PbCl}_{4}$

${PbF}_{4}$

${BiCl}_{5}$

answer is A.

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Detailed Solution

The size of the elements increases as we move down the periodic table, from fluorine to iodine. $(F < C l < B r < I)$

Bonding weakens as the size of the elements grows larger.

Pb has a large size, as do Cl, Br, and I.

Because of their larger sizes, the steric hindrance on the central atom, i.e., Pb, increases.

This makes it difficult for the atoms to come together to form the compound.

As a result, the order of stability is as follows: $P b F_{4} > P b C l_{4} > P b B r_{4} > P b I_{4}$

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