Answer:
\[PbC{{l}_{2}}\] is an ionic
crystalline solid while \[PbC{{l}_{4}}\] is a molecular solid in which \[PbC{{l}_{4}}\]
molecules are covalent in nature. This is because of smaller size and more
positive charge on ion as compared to \[P{{b}^{2+}}\] ion. The former polarises
the anions more than the latter and the compound acquires covalent nature.
Thus, \[PbC{{l}_{4}}\] has less melting point than \[PbC{{l}_{2}}\], and therefore,
it is less stable.
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