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

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MF > MCI > MBr > MI

MF > MCI > MI > MBr

MI > MBr > MCI > MF

MCI > MI > MBr > MF

answer is C.

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Detailed Solution

As the size of halide ion decreases, I⊖>Br⊖>Cl⊖> F⊖, tendency to get polarised by cation M⊕ decreases and hence covalent character decreases.

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