1. Tardigrade
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  3. Chemistry
  4. Among the following the maximum covalent character is shown by the compound

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Q. Among the following the maximum covalent character is shown by the compound

Chemical Bonding and Molecular Structure

Solution:

Covalent character is favoured by Fajans’ rule.
(i) Larger the charge on the ions,
(ii) Smaller the size of cations,
(iii) Larger the size of anions.
(iv) Cation with $18$-electron structure (e.g., $Cu^+$), then larger the polarizing power and the covalent character is favoured.
In all the given compounds, anion is same $(Cl^-)$, hence polarizing power is decided by size and charge of cation. $Al^{3+}$ with maximum charge and smallest size has maximum polarizing power hence, $AlCl_3$ has maximum covalent character.