First slide

Alkali metals

Question

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

Moderate

A

MF > MCI > MBr > MI
B

MF > MCI > MI > MBr
C

MI > MBr > MCI > MF
D

MCI > MI > MBr > MF

Solution

As the size of halide ion decreases, $I^{⊖} > {Br}^{⊖} > {Cl}^{⊖} >$ $F^{⊖},$ tendency to get polarised by cation $M^{\oplus}$ decreases and hence covalent character decreases.

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