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In the case of alkali metals, the covalent character decreases in the order:

1. MF > MCl > MBr > MI
2. MF > MCl > MI > MBr
3. MI > MBr > MCl > MF
4. MCl > MI > MBr > MF

Correct answer: MF > MCl > MI > MBr

Solution

The covalent character of alkali metal halides increases with the size of the halogen atom. Therefore, the order of decreasing covalent character is MF > MCl > MI > MBr.

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