1.

PbF_(4), PbCL_(4) exists PbBr_(4) and PbI_(4) do not exist because of

Answer»

large size of `Br^(-) and I^(-)`
STRONG oxidising character of `Pb^(4+)`
Strong REDUCING character of `Pb^(4+)`
Low electronegativity of `B^(-) and I^(-)`

SOLUTION :F and Cl are more oxidising in nature and can achieve Pb in (IV) O. S but `Br_(2) and I_(2)` can not achieve Pb in (IV) O.S secondly `Pb^(4+)` is strong in oxidising nature and in its presence, `Br^(-) and i^(-)`can not exists.


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