Maximum covalent character is associated with | vedclass

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Question

(D) According to Fajan's rule,covalent character increases with an increase in the polarising power of the cation and the polarisability of the anion.

Vedclass · Accepted Answer

$AlI_3$

Vedclass · Answer

(D) According to Fajan's rule,covalent character increases with an increase in the polarising power of the cation and the polarisability of the anion.$1$. The polarising power of the cation increases as the charge density increases (higher charge and smaller size). Here,$Al^{3+}$ has the highest charge among $Na^+$,$Mg^{2+}$,and $Al^{3+}$.$2$. The polarisability of the anion increases with its size. Among $Cl^-$ and $I^-$,the iodide ion $(I^-)$ is larger and more polarisable.$3$. Therefore,$AlI_3$ has the cation with the highest charge and the anion with the highest polarisability,resulting in the maximum covalent character.

Maximum covalent character is associated with the compound:

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