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Among the compounds listed below, which one exhibits the greatest covalent character?

1. AlCl3
2. MgCl2
3. FeCl2
4. SnCl2

Correct answer: AlCl3

Solution

By Fajans' rules, a small, highly charged cation polarizes the anion strongly, giving more covalent character. Al3+ (charge +3, small size) has the highest polarizing power, so AlCl3 is the most covalent.

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