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  4. Which compound is highest covalent?

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Q. Which compound is highest covalent?

AFMCAFMC 2007Chemical Bonding and Molecular Structure

Solution:

The magnitude of polarised or increased covalent character depends upon a number of factors. These factors are
1. Small size of cation : Smallest size of cation greater is its covalent character.
2. Large size of anion : Larger the size of anion greater is its covalent character.
3. Large charge on either of the two ions : As the charge on the ion increases, the covalent character increases.
Hence,
In $Lil$, due to larger size $I ^{-}, LiI$ is more covalent.