NEET 2009 Chemistry question

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 > MFCorrect
(4)MCl > MI > MBr > MF

Answer: (3)

Solution

By Fajans' rules, covalent character increases with the polarisability of the anion. The size of the halide ion increases in the order , so the polarisability and covalent character of the

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Question ID VK-090289